It’s a familiar scenario: you’ve prepped, applied, and aligned—only to see adhesive fail when things get a little wet. High humidity, damp surfaces, or weather exposure can disrupt the molecular structure of many adhesives, leaving behind weak and unreliable results.

For nearly a century, Leech Adhesives has engineered solvent-based solutions to combat those challenges. What began as a single batch of construction glue in 1930 has grown into a trusted, Made-in-the-USA line of adhesives, sealants, and caulks. 

At the center of our lineup is Leech F-26® Construction Adhesive—a waterproof, performance-grade formula trusted by professionals and homeowners alike for its strength, durability, and consistency in extreme environments. Short on time? Scroll down to see common questions.

No Sweat Bonds: Why Some Adhesives Don’t Mind Moisture

Why do some adhesives stand up to water while others break down? It comes down to chemistry. Waterproof adhesives are designed to resist moisture infiltration and maintain bond strength under constant exposure. Here’s how:

The Leech F-26® Advantage: Dependable Bonds in Damp Conditions

With F-26®, science meets performance. It was the first adhesive to surpass APA AFG-01 standards for gluing plywood to wood flooring joists. But that’s just the beginning.

• Wet & Frozen Application: Bonds even on wet or frozen surfaces.
  
• All-Weather Formula: Works in temps from 0⁰F to 120⁰F; once cured, it holds strong from -20⁰F to 150⁰F.
  
• Shockproof & Gap-Filling: Resistant to vibration and flexing. Fills gaps for stronger adhesion on irregular surfaces.
• Strength Over Time: Bond strength increases with age, providing unmatched long-term durability.

Real-World Applications

Some jobs demand a waterproof, vibration-resistant adhesive. Here’s where F-26® excels:

• Subfloors: Eliminates squeaks and stays flexible in damp conditions.
  
• Decks & Treated Lumber: Excels in fluctuating outdoor environments.
  
• Rock, Concrete & Pavers: Ideal for hardscape projects exposed to the elements.
  
• Insulation Installation: Bonds fiberglass and fiberboard while filling voids for solid insulation adhesion.
  
• Doors, Moldings & Stair Treads: Delivers strong, lasting bonds on both wood and metal, with excellent aging quality.
• New Build & Remodeling: What the pros use for both interior & exterior projects

Trust the Tube That Gets It Done

When weather, wear, and water threaten to derail your project, professionals trust one tube: F-26® Construction Adhesive. It’s the go-to solution for jobs that demand strength, durability, and moisture resistance. 

Need technical help or product recommendations? Contact us with your questions.

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FAQs: Leech F-26® and Moisture

Q: Can Leech F-26® be applied to wet or frozen surfaces?

A: Yes. F-26® is engineered for real-world conditions and can bond to wet or frozen surfaces, making it ideal for outdoor or jobsite use in unpredictable weather.

Q: What temperatures can F-26® handle during and after application?

A: It can be applied in temperatures from 0°F to 120°F. Once cured, it remains effective in a range from -20°F to 150°F.

Q: What materials does F-26® bond best with?

A: F-26® works on a wide variety of surfaces including wood, treated lumber, concrete, metal, fiberglass, fiberboard, insulation materials, and more. Learn more about capabilities! If your projects include vinyl, soft plastics, or tub surrounds, check out our F-13® construction adhesive. 

Q: Does it fill gaps or irregular surfaces?

A: Yes. F-26® has excellent gap-filling properties, making it ideal for bonding uneven surfaces or bridging small voids.

Q: Is it suitable for long-term outdoor use?

A: Yes. It’s formulated to withstand weather extremes, UV exposure, and moisture, providing long-term durability for decks, subfloors, and outdoor masonry.

The Role of Adhesives in Modern Construction

The construction industry has evolved dramatically over the last century, shifting from purely mechanical fastening methods to smarter, more efficient bonding solutions. While traditional tools like screws and nails still have their place, the rise of high-performance construction adhesives has introduced new possibilities in strength, versatility, design, and speed.

Advantages Over Traditional Fastening Methods

​​In the past, construction relied heavily on screws, nails, and bolts to hold materials together. While these methods are still useful in certain scenarios, modern adhesives offer a more advanced solution. 

Strength and Durability

With quality adhesives, the load is distributed across the surface rather than focused at one point via traditional fasteners. That means fewer stress points, better vibration absorption, and a build that resists common issues like screw pops or material splits.

Aesthetic Freedom

Adhesives allow for cleaner, smoother finishes—no visible hardware, no patching, no visual interruptions. Whether you’re installing decorative wall panels or seamless flooring, adhesives preserve the design while reducing cleanup and finishing work.

Faster, Safer, More Efficient

Because adhesives reduce the need for mechanical fasteners, installation is quicker, cleaner, and often safer. There’s less drilling, fewer tools, and less risk of damage to materials. Adhesives are also lighter, which helps in overhead or delicate work.

Ultimate Versatility

From bonding glass to metal, securing wood over concrete, or attaching paneling in complex layouts—adhesives expand what’s possible. They handle dissimilar materials and varying conditions in ways that fasteners often cannot.

Modern Adhesive Chemistry

Here’s what different adhesive types offer and when to use them:

Adhesives in Action

Structural Bonding

Think of this as the backbone of modern construction. High-strength adhesives like epoxies and polyurethanes aren’t just holding things together—they’re reinforcing critical load-bearing elements. Whether it’s bonding concrete slabs or locking steel bars in place, these adhesives create structural connections you can count on.

Facade and Glazing Systems

Ever admired a sleek glass building with no visible fasteners? That clean, uninterrupted look is brought to you by structural silicone adhesives. They don’t just hold massive glass panels in place—they flex with wind, absorb thermal shifts, and deliver that smooth, high-design finish architects dream about.

Insulation and Sealing

It’s not flashy, but it’s crucial. Adhesives keep buildings comfortable and efficient by creating airtight, watertight seals. From roofing membranes to insulation boards, they help block drafts, moisture, and energy loss—saving more than just your electric bill.

Flooring and Finishing

When it comes to floors and finishes, adhesives are the unsung heroes. From vinyl and hardwood to tile and trim, they keep everything locked in and looking sharp—no creaks, no cracks, no kidding.

Prefabricated Construction

Adhesives are MVPs in the prefab world. By speeding up assembly and cutting down on mechanical fasteners, they help manufacturers produce stronger, cleaner, and more precise components—delivered ready to install with confidence.

Real‑World Applications of Modern Adhesives

These are some common project types where using the right adhesive makes a real difference:

• Subfloors (eliminating squeaks, improving long-term hold)

• Decorative paneling and drywall

• Outdoor fixtures, siding, and decks

• Masonry and stone veneers

• Metal trims, thresholds, and moldings

Adhesives That Set the Standard

Since 1930, Leech Adhesives has delivered trusted performance across construction, remodeling, and repair. Our products are engineered for real jobsite conditions and deliver long-term hold, flexibility, and resistance to moisture, vibration, and temperature changes.

Whether you’re bonding subfloors, installing fixtures, or joining dissimilar materials, Leech has a proven solution built to perform. 

See Our Products

Choose the Best Adhesive for Your Project

Adhesives aren’t just accessories—they’re foundational components in modern construction. Choosing the right chemistry, understanding your materials and environment, and following best practices can mean the difference between a floor that creaks after a season and one that holds together for decades.

Stick with Leech. One Brand, Every Bond.

A properly placed mirror can enhance the feel of any space. From offices to bathrooms, they not only add functionality but also help make the space feel larger. However, mirrors are tricky. Not installed properly, and they come crashing down. That could happen right away. It could happen a week later.

It’s important to note that many construction adhesives, including some silicones, may not be compatible with the silvered backing of mirrors and can cause it to fail or be damaged over time. 

For mirror installation, we recommend our F-13® construction adhesive. 

Why? Because F-13® is specifically formulated to cure at lower temperatures, making it the ideal choice for delicate or burn-sensitive substrates like mirrors. Its quick grab, flexible hold, and water resistance make it perfect for secure, lasting mirror installations without compromising aesthetics.

Using the right technique is crucial for a lasting and safe results when installing mirrors. As a leader in professional-grade adhesives, Leech Adhesives is committed to helping builders, contractors, and homeowners achieve reliable results on every project. 

Disclaimer: Our recommendations for adhesive use in this application are based on tests believed to be reliable. We make no guarantee or warranty, expressed or implied, as to such use or the results to be obtained. 

Moisture Is the Enemy

If you don’t want a mirror to fall, don’t place it in an area where there’s significant moisture. That’s a problem, though. Mirrors are commonly in wet environments like bathrooms – have you ever been in a bathroom with no mirror? It doesn’t feel right. As a result, you need to consider a few strategies to make moisture less of a problem.

Moisture can damage a mirror, leaving the silver backing damaged, creating stain marks and a black edge along the surface. To avoid this, follow these tips:

Prepare for a Dry Install

Keep the area dry for several days before and at least 24 hours after installing the mirror. This is crucial for allowing the adhesive to cure properly before any moisture is introduced.

Seal the Bottom Edge

Seal the bottom of the mirror with silicone. This is a vital step, especially for mirrors over sinks, as it prevents moisture from getting under the glass and causing damage to that vulnerable edge.

Know Your Adhesive’s Rules

Always read the label to know the exact curing time for your specific adhesive. Do not introduce any moisture to the area until the glue is fully cured, which may be longer than 24 hours.

Carefully Consider Size

Huge mirrors can be statement pieces, but they are also highly risky to install. If you’re installing a mirror that’s more than 48 inches wide, you’ll need more than adhesive and hope to hold it in place. A built wooden structure to support the mirror becomes critical.

There are various reasons for that. For example, most interior walls are never going to be fully flat. Small areas of unevenness are forgivable. However, the wider the mirror is, the less it can tolerate those areas. This leads to distortion in images and could create problems for adhesives to hold it in place over time.

It’s often better to choose several mirrors to cover the expansiveness of a hallway or larger wall instead of a single mirror. There’s far less weight demand on the drywall. There’s also less risk of the adhesive losing its grip.

Mirror Installation Tips

Now that you have the foundation of mirror installation, let’s talk about the actual process that’s necessary. Focus on getting these steps right (don’t rush it!) to minimize the risk of falls.

Keep it dry

If you’re installing a mirror in the bathroom, keep that space off-limits for a day or two prior to the installation. Make sure there’s no moisture in the area. Ideally, you’ll want to keep the temperature in the space between 60 and 85 degrees Fahrenheit until the glue cures.

Prepare the wall

After wiping down the surface, prime over the drywall and plaster surfaces. By doing this, you create an even base to support the installation process. Priming the drywall and plaster should occur no matter where you plan to install the mirror.

Sand down glossy painted surfaces

If you’re placing the mirror on a surface that was previously painted, especially if it is a shiny or gloss paint, it’s critical to sand down the surface. That gloss makes it far more challenging for the adhesive to hold in place. After you sand it down thoroughly, there should be no sheen left on the surface.

Clean the surfaces

Next, clean the surface of the wall to remove any dust, debris, sanded drywall, or other substances. Don’t wet it – just wipe it down or use a hand-held vacuum to pull off any particles. This should be done right before you plan to place the mirror.

Clean the back of the mirror next. Again, remove anything that’s not supposed to be there. Stickers, debris, and dust all create points where the adhesive cannot hold onto the surface properly. By removing it, you create more of a hold on the adhesive.

Don’t Rush the Process

The final thing to remember is not to rush the process. This isn’t a simple project. By putting a bit more time into it, you reduce the risk of problems down the road, including that mirror crashing to the ground.

Why Choose F-13® for Interior and Light-Duty Construction Applications?

F-13® Construction Adhesive is the go-to choice for precision, flexibility, and ease in interior and light-duty construction work. Specifically formulated for bonding materials like polystyrene foam, tub enclosures, drywall, paneling, and plywood, F-13® delivers strong performance where reliability matters most.

What sets F-13® apart?

• Versatile Application: Ideal for foam panels, tub surrounds, drywall, plywood, paneling, and even metal.
• Water Resistant: Built to hold up in moist environments without deteriorating.
• Stays Flexible: Retains ductility over time—resisting brittleness and cracking.
• Quick Bond Strength: Offers a strong initial hold and a generous 10-20 minute working time.
• Cold-Weather Friendly: Applies and cures in temperatures as low as 0°F.
• Industry Tested: Exceeds ASTM C557 and ASTM 572-3 specifications for quality and strength.

Whether you’re tackling a bathroom renovation, installing foam board insulation, or hanging decorative paneling, F-13® delivers dependable results without the hassle of overly rigid products. It’s engineered to make your job easier—especially when precision, flexibility, and moisture resistance matter.

Explore our full product lineup or contact our team for help choosing the right solution for your next job.

Stick with Leech. One Brand, Every Bond.

Working in the construction industry is a messy job, but when construction adhesive ends up on your favorite pair of work pants or a company uniform, things can get even more complicated. If left untreated, glue can dry into fabric and become incredibly difficult to remove. Fortunately, with the right approach, you can effectively remove construction glue from clothing and salvage your gear.

Before you grab a solvent or toss your shirt in the wash, it’s important to understand how adhesives behave and what methods work best for specific types of fabric and glue. This guide will walk you through step-by-step instructions for construction adhesive stain removal and offer tips for removing even the toughest construction adhesives from your clothing. 

How to Clean Glue Off Clothes

Before you begin, it’s important to know that not all construction adhesives behave the same. Some are water-resistant, others are designed for permanent bonding, and a few may require solvents to break down. The method you use to remove construction glue from clothing should match the adhesive type and the fabric you’re working with. Start with the least aggressive approach first, then work your way up if needed.

Scrape Off Excess Glue

The sooner you act, the better. It’s far more challenging to get dried glue out of fabric. It’s essential to move quickly and remove as much of the product as possible before it dries. To remove construction glue from fabric start with the following steps:

• Use a dull-edged tool like a putty knife or butter knife to gently scrape away as much of the glue as possible.
• If the glue is still tacky, blot with a clean, dry cloth to soak up what you can.
• Avoid scraping too hard or using sharp objects, which can damage the fabric.

Removing the top layer first gives you a better chance of success in the steps that follow.

Soak to Loosen the Adhesive

If the glue has already started to dry or cure, don’t panic. It is possible to get dried glue out of fabric with a few extra steps. To remove construction glue from clothing after it has dried, you’ll need to reactivate it. Depending on the type of construction glue, soaking the fabric can help soften the adhesive and make it easier to lift. 

• Fill a basin with cold water and submerge the stained area for about 10 to 15 minutes. 
• Gently agitate the fabric by hand, rubbing the glue spot to encourage loosening.
• Avoid hot water, which can cause the adhesive to set permanently into the fibers.
  

It may be possible to perform this step with a solution that is safe for the fabric. However, if the fabric cannot tolerate cold temperatures or detergents, it’s best to skip this step.

It’s important to note that this approach works best on adhesives that haven’t fully cured or that respond to moisture. For high-performance, waterproof glues, you’ll likely need a solvent to fully break the bond.

Try a Targeted Solvent

If soaking doesn’t fully release the adhesive, it may be necessary to choose a product that is going to be a bit more aggressive. The right solvent can help break down the bond and make it easier to remove construction glue from fabric. Before applying any product, test a small, hidden section of the fabric to avoid discoloration or damage.

The following strategies can help with most construction adhesive stain removal:

• Adhesive remover – Choose a remover that’s designed to remove construction adhesives. Follow the manufacturer’s instructions closely and use it in a well-ventilated area. Some adhesive removers may be too harsh for certain types of fabrics.

• Rubbing alcohol – Gently dab with a cloth and apply in circular motions, working from the outside in. It works well on many fabrics and softens glue without harsh fumes.

• White vinegar – A natural option for cleaning clothes with glue stains. Apply with a clean towel, rub gently into the glue, and blot away residue.

• WD-40 – A strong option for tough adhesives. Spray directly onto the glue, wait a few minutes, then wipe clean. Use caution on delicate fabrics and rinse thoroughly before washing.

In each of these strategies, after applying the cleaning method and removing as much of the glue as possible, launder the clothing as you normally would. Note that products like adhesive remover and WD-40 contain chemicals that may need to be rinsed out of the material before washing it in the machine.

Avoid These Mistakes When Removing Construction Glue from Clothing

Even with the right tools and techniques, a few missteps can make adhesive stains harder to treat. Avoid these common mistakes to give yourself the best shot to remove construction glue out of clothes:

• Avoid the use of heat: Hot water or a dryer can cause glue to cure into the fabric, making it far more difficult—or impossible—to remove.

• Always test first: Before applying any solvent, test a small area of the fabric to make sure it won’t stain or degrade.

• Don’t over-saturate: Most cleaning agents only need a small amount applied to a cloth—not directly to the fabric.

• Always consider the fabric: Some fabrics simply cannot be laundered and need to be dry cleaned. Removing dried-on glue from these types of fabrics may not be possible.

While cleaning clothes with glue stains isn’t always easy, patience pays off. By using the right techniques—and repeating steps if needed—you can often remove construction glue from fabric and get your workwear back in action.

Sealants and Adhesives That Stick Where They Should

At Leech Adhesives, we engineer high-performance products built to stay put where they’re supposed to. Whether you’re bonding wood, tile, metal, or masonry, our products are built to perform.

Explore our full product lineup like VOC Compliant Construction Adhesive or contact our team for help choosing the right solution for your next job.

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Choosing a high-quality masonry adhesive is key to making sure your stone, brick or concrete projects stand up against the elements. However, with so many adhesive products on the market, it’s easy to pick the wrong one—which can lead to unreliable results and wasted time and materials. 

In this article, we’ll break down common outdoor masonry glue applications, what to look for in a product, and why professionals turn to trusted solutions like Leech Adhesives’ premium waterproof construction adhesive when performance matters most.

When to Choose Masonry Adhesives

Masonry adhesives are useful across a wide range of applications. In the right conditions, they can be used for your project from start to finish—whether you’re making small repairs or building something new.

High-quality masonry adhesive can be applied in a wide range of situations, including:

• Most types of brick
• Stone applications
• Concrete block
• Veneer installations
• Landscaping projects

High-strength construction adhesives are designed to perform in tough conditions, including extreme heat, moisture, freezing temps, or a combination of all three.

Construction Adhesive Considerations

When working in construction, choosing the right masonry adhesive comes down to performance. The adhesive must be strong enough to handle the demands of the job—whether it’s bonding subfloors or securing stone. 

Leech F-26® Construction Adhesive is engineered for exceptional durability. It meets and exceeds American Plywood Association AFG-01 standards—some of the toughest in the industry—making it a dependable solution for a wide range of masonry and structural applications.

F-26® Adhesive is ideal for bonding plywood to wood flooring joists as well as numerous other applications. It can also handle the most intense environments, maintaining exceptional durability through a variety of changes in weather and temperature.

Why F-26® Is One of the Best Adhesives for Masonry Work

When you’re working with stone, brick, or concrete, your adhesive needs to perform under pressure, flex with the materials, and stand up to the elements. F-26® delivers on all fronts, combining long-term strength with jobsite versatility.

Here’s what sets it apart as a trusted choice for stone and brick bonding solutions:

• Tested in both lab and field for long-term strength and reliability
• Maintains performance even under vibration or flexing
• Cures to a bond that strengthens over time
• Fills gaps and bridges surface irregularities
• Exceeds key performance standards: AFG-01, ASTM-C-557-73, and FHA/HUD #60
• Designed to hold up in tough outdoor environments year after year

If you’re looking for a high-strength construction adhesive that works across surfaces and conditions, F-26® is built for the job.

How to Apply F-26® for a Long-Lasting Bond

Applying F-26® Adhesive is quick and straightforward, but following the right steps ensures a durable, long-term hold. For the best results follow this simple application process:

• Apply the adhesive to one of the surfaces being bonded.
• Press the two materials together briefly to spread the adhesive.
• Pull them apart and let the adhesive sit for 15 to 40 seconds—this is a critical step that  activates the bonding mechanism.
  Rejoin the materials and apply firm, even pressure for a few moments.
• Allow curing to begin. The bond sets quickly and continues to strengthen over 24 hours, reaching full hold after about one week.

Common Applications for the Best Masonry Adhesives

Masonry adhesives are versatile and can be used in a range of indoor and outdoor applications. Here are some of the most common uses:

Before starting, always review the manufacturer’s instructions to confirm material compatibility and application limits. Not all adhesives are designed to perform under the same conditions.

Why the Right Masonry Adhesive Makes All the Difference

Not all adhesives are built to handle the demands of masonry work. Using a product specifically designed for stone and brick bonding solutions helps ensure a durable hold that lasts. A high-quality masonry adhesive like F-26® offers:

• A strong, long-lasting bond that protects the integrity of your work
• Resistance to moisture, heat, and freezing conditions
• Easy application with no need to rework or redo the job

Whether you’re patching a wall, installing veneer, or securing pavers, choosing the right adhesive means fewer headaches and better results.

Reliable Stone and Brick Bonding Solutions for Any Project

Leech Adhesives has built its reputation on performance, reliability, and innovation for over 90 years. Whether you’re repairing a wall or tackling a full-scale build, our high-strength construction adhesives—like F-26®—are engineered for long-lasting effectiveness in the toughest conditions. Trusted by contractors and DIYers alike, our products are made to hold strong, stay strong, and stand the test of time. Proudly made in the USA.

Explore our full line of construction adhesives to find the right fit for your specific application.

Have questions or need guidance? Reach out to our team—we’re here to help you get the job done right.

Stick with Leech. One Brand, Every Bond.

At Leech Adhesives, our adhesives and heavy-duty construction glues are built to perform—no matter the user. But understanding the most common mistakes made during application can go a long way in ensuring your project sticks the first time. Whether you’re using our trusted formulas or another product, getting the prep, environment, and application just right is key to a bond that lasts.

Mistake #1: Misunderstanding the Bond—Cohesion vs. Adhesion

Many adhesive failures stem from a failure to distinguish between surface grip and internal strength.

• Adhesion failure: Glue simply peels off cleanly—it never formed a hold on the surface. Usually it’s a prep problem.
• Cohesion failure: The adhesive sticks, but breaks apart internally under stress—like a weak spine.

Fix: Diagnose the failure—if it peels, improve prep; if it crumbles, use a stronger, more durable glue. Products like F‑26® provide both solid adhesion and internal cohesion.

Mistake #2: Neglecting Surface Prep

Skipping proper surface prep is a top cause of bond failure. Dirt, debris, moisture, old glue, and grease all prevent a strong bond.

Fix: You need a clean, dry, contaminant-free surface for the adhesive to grip. Over- or under-prepping can damage the substrate or leave smooth spots where glue can’t grab. Always follow product-specific instructions to avoid this pitfall—and remember, F-26® was formulated to work for every professional, in every climate, with minimal prep work on substrates.

Mistake #3: Ignoring Environmental Conditions

Temperature, humidity, and moisture levels directly affect how well an adhesive cures and performs.

Think about your jobsite: is it steamy? Below freezing? If you use a product not formulated for those conditions, your bond may never reach full strength—or could degrade quickly over time. Choose an adhesive that suits your environment. Leech adhesives like F‑26® handle extreme conditions from wet and frozen to steamy and sweltering.

Mistake #4: Using Too Much—or Too Little—Adhesive

More glue isn’t always better, and less glue means weak spots.

Applying too much adhesive prolongs drying and cure times—or even prevents curing altogether. Too little, and you leave gaps that compromise integrity. Follow the manufacturer’s coverage and thickness guidelines, and use the right tools—like a caulking gun—to apply it correctly the first time.

Mistake #5: Skipping or Rushing the Cure

Time matters when it comes to curing. Applying weight too soon, using heat to force-dry, or not allowing full cure time will undercut bond strength.

Let the adhesive set fully as per instructions—you’re paying for performance, so give it the chance to reach its full potential. 

F-26 was formulated for construction professionals. The formulation will achieve a strong bond the first 24 hours. The bond will continue to build strength over the next 7 days, all while remaining flexible!

Mistake #6: Choosing the Wrong Adhesive

Lastly, you can’t fix a failure by reapplying the wrong product. Bonding tasks require the right adhesive formulation.

Wrong glue = unreliable bond, callbacks, and weakened builds. Use adhesives like  F‑26® for demanding exterior or structural jobs. 

Important: Be sure to read all recommendations and instructions for each substrate prior to applying any Leech Adhesives product. If unsure, test a small amount of adhesive on each substrate. Sometimes, removal of coating or solvent is recommended. “Scuffing” the surface on substrates may also help adhesive grab hold!

Your Finish Deserves a Strong Start

When in doubt, reach out. At Leech Adhesives, we’re here to help you make the right choice for every job, every substrate, and every condition.

Need technical help or product recommendations? Contact us with your questions.

Stick with Leech. One Brand, Every Bond.

Choosing the right construction adhesive requires a surprising amount of thought. With so many options, it’s easy to grab the wrong one and end up with results that don’t stick.

Questions to Ask Before You Grab the Glue:

Powerful and Long Lasting Performance

Knowing what material or substrate you need to bond is an obvious first step. Any product you select must be designed specifically for the type of materials you hope to bond together. Do not assume all products are the same.

Consider the following aspects when selecting the best construction glue for a specific project.

Formulation & Substrates

Select a strong construction glue suitable for the type of materials you need to join together. Read the description of each product carefully to ensure you get it right.

• Wood and OSB: Polyurethane glues are ideal for wood-based materials, offering strong, flexible bonds that hold up to expansion and contraction.
• Glass and Metal: Epoxy adhesives provide superior strength and durability on non-porous surfaces like glass and metal, making them the go-to choice for high-stress applications.

The Environment

While formula matters, what is really going to influence the bond strength over time is the environment. Changing temperatures and moisture levels can create highly unstable conditions. Understand the conditions:

• What level of moisture is likely to be present on an ongoing basis?
• What are the temperature extremes for the environment?
• What level of vibration is expected?

Often, these factors are unknown, which means you need to consider a product that’s more versatile and can handle more intense and changing conditions. Some products do this better than others.

For example, our F-26® construction adhesive is a versatile product that can work long term. It can be used on fiberglass, fiberboard, metal moldings, metal wall studs, plywood, and numerous other surfaces to create a strong bond in various applications, including construction, remodeling, and repair.

What makes it beneficial is that it bonds even when materials are wet or frozen, making it a solid product available all year round. It can also reliably withstand climate extremes ranging from 0 degrees to 120 degrees. It is also not impacted by humidity. As a construction glue, it is an all-around solution.

Strength and Flexibility of Products

Construction glue properties must also be considered, not just for their strength, but also for the flexibility they offer. A product that creates a strong bond is beneficial, but changing conditions and movement, including frequent, consistent, or infrequent vibrations, can create stability issues if the product lacks sufficient flexibility.

Waterproof Products

Another factor to consider when choosing construction glue is how well the product performs in wet conditions. That is not just humidity, but rather the level of moisture in the environment. Whether you are using it in a shower enclosure or an outdoor project, there is often a need for a strong product that can withstand wet conditions specifically.

For waterproofing, a product like F-26® is designed for humid or moist worksite conditions. It is formulated to resist moisture, maintaining a strong hold over time. If you’re looking for a construction glue suitable for outdoor projects or other areas with a significant risk of constant moisture, this is the option for you.

Increasing Glue Strength and Results

When selecting a heavy-duty construction glue, it’s essential to think beyond the product label. Consider the full scope of your project—materials, environment, and application method—to get the most from your adhesive. While glue properties vary widely, these steps can help you maximize strength and ensure dependable results:

• Step 1: Prep Like a Pro
  A clean, dry, and dust-free surface is non-negotiable. Remove any oils, debris, or old adhesive residue—anything that could interfere with bonding.
• Step 2: Clamp When You Can
  For flat surfaces, adding weight or clamping helps adhesives set more securely. Just be careful not to disturb the alignment, and don’t rush the curing process.
• Step 3: Let It Cure Completely
  Full curing is essential. Don’t apply stress to the bond before it’s ready—adhesives need time to reach full strength. Skipping cure time can mean early failure.
• Step 4: Know Your Adhesive Type
  Understand the type of bond you’re forming—chemical adhesion (molecular bonding) or mechanical adhesion (gripping into the surface texture). Not all construction adhesives behave the same across different materials.
• Step 5: Choose Quality, Not Shortcuts
  Always use a high-quality product suited to the job. Cheaper alternatives may not hold up under pressure—literally.
  

At the end of the day:

• Match the adhesive to your materials and environment
• Follow the manufacturer’s instructions precisely
• Don’t cut corners and focus until you are done

Stick with Strength: Choose Wisely, Apply with Confidence

Choosing the right construction adhesive isn’t just about grabbing a tube—it’s about matching the product to your materials, environment, and performance needs. With trusted options like Leech F-26®, you get the strength, flexibility, and weather resistance pros rely on. Follow the right steps, and your bond will go the distance! Have questions? Visit our FAQ page or contact our team! 

Stick with Leech. One Brand, Every Bond.

When it comes to creating strong, lasting bonds with construction adhesives, understanding when you need surface preparation and how to prep is just as important as choosing the right glue. 

Whether you’re working with wood, concrete, or metal, skipping prep can lead to weak seals, premature failures, and costly callbacks. The good news? A little prep goes a long way—and with our F-26® adhesive, you don’t need to do much at all.

F-26® is engineered to perform in less-than-ideal conditions. Wet or frozen substrates? No problem. Unlike many adhesives that demand precise prep conditions, F-26® grabs hold fast—even when jobsite realities get messy. That means more uptime, less downtime, and fewer headaches for contractors who don’t have time to wait on the weather.

Now, although F-26® requires minimal prep, we do think it’s important to discuss proper surface preparation for various substrates and products.

Different Surfaces = Different Prep

Every material you work with behaves differently. Knowing how to prep each one is key.

Wood

Wood is porous and usually requires minimal prep. Clean the surface thoroughly and ensure it’s at the recommended temperature range (typically between 55°F and 86°F) for optimal adhesion. 

Asphalt or Concrete

More finicky surfaces like asphalt or concrete need to be completely dry. Often, heating is required to help the adhesive flow and bond. Use a pressure blower to remove debris from textured surfaces without introducing moisture.

Metal and Plastics

Smooth materials often need extra help. Roughing up the surface creates more grip for the adhesive—just like Velcro. Use coarse sandpaper or a file to abrade the surface lightly.

Key Surface Prep Methods

1. Keep It Clean

Dust and debris are bond killers. Whether you’re working on subfloors or paneling, make sure your surfaces are free of particles. Use a vacuum or compressed air to clear out cracks and crevices—especially on rough surfaces.

2. Rough It Up

Smooth materials? Give them some texture. A light abrasion with sandpaper helps your adhesive grab and hold. This step is especially important for plastics, metals, and coated surfaces.

3. Degrease Before You Glue

Some surfaces—like factory-coated metals or composites—may have a greasy or waxy finish that resists adhesive. Use a degreaser to break down the film, then allow the surface to dry completely before applying adhesive.

4. Solvent Clean

When a surface has a polymer or chemical coating, a solvent may be needed to remove it. After applying the solvent, wipe it clean with a dry cloth and let it sit for a few minutes before applying adhesive.

5. Good Ol’ Soap & Water

For less complicated materials like plastics or composites, warm soap and water often do the trick. Just avoid any soaps with dyes or fragrances that could interfere with the adhesive.

Combine Steps as Needed

On the jobsite, you’ll often need to combine prep steps. You might:

• Degrease, then abrade, then wash 
• Or just clean with air or water

Quick Surface Prep Checklist

Stick With Leech for Long-Lasting Bonds

At Leech Adhesives, we’ve been helping contractors get reliable results since 1930. Whether you’re building subfloors, bonding paneling, or sealing thresholds, our adhesives are built to perform—when the prep is done right.

Using F-26®? You’ve already chosen a premium adhesive. Now you can get to work on your project with minimal preparation and get more done in less time! 

Stick with Leech. One Brand, Every Bond.

When building or repairing hard surfaces, understanding the difference between adhesive and sealant is critical. While sealants and adhesives are both used to protect and bond materials, they serve very different purposes. Mixing them up can lead to premature failure, structural damage, or costly rework down the line.

At Leech Adhesives, we offer a wide range of both adhesives and sealants to fit most project needs. Yet, it is important to know which one to choose. In this guide, we’ll break down the difference between adhesives and sealants, when to use them, and how to choose the right option for your next project. 

When to Use Sealant vs Glue

Using a sealant in place of an adhesive—or vice versa—is a common mistake. But, applying these products interchangeably can lead to poor results, failed installations, and costly rework.

What Are Sealants?

In construction sealants are often applied where materials meet or move, such as along edges, seams, and expansion joints. Unlike most adhesives, sealants are designed to remain flexible—allowing them to absorb movement, vibration, and settling without cracking or separating. That flexibility makes them ideal for areas exposed to moisture, temperature changes, and other environmental stress.

Sealants are commonly used in places like:

• Kitchens and bathrooms to block moisture
• Roofing surfaces exposed to UV and extreme temperatures
• Concrete and masonry joints that expand and contract
• Exterior applications where airflow and water intrusion are a concern

A trusted solution is Leech RTV Silicone and Rubber Sealant—a versatile product for both interior and exterior use. It offers excellent flowability, minimal shrinkage, and strong adhesion on materials like doors, windows, counters, and A/C units.

What Are Adhesives?

Adhesives are designed to create a strong, lasting bond between two surfaces—holding them firmly in place. Unlike sealants, adhesives are not meant to flex or move. Instead, they’re built to deliver structural strength, forming a rigid connection that ensures surfaces stay in place, even under stress.

When the right construction adhesive is used, it can form a highly durable bond—capable of joining materials that are either similar in composition, like wood-to-wood or metal-to-metal, or completely different, such as attaching plastic to concrete or foam to drywall. This versatility makes adhesives a valuable tool across a wide range of construction and repair projects.

Common applications include:

• Bonding tile to drywall
• Installing flooring
• Securing countertops
• Attaching heavy materials to surfaces like wood, metal, or concrete

Choosing a high-quality adhesive is essential for ensuring a strong, reliable bond—especially when working with different materials or in demanding environments. At Leech Adhesives, we offer professional-grade solutions designed to meet a wide range of construction needs. 

Our F-13® Construction Adhesive is a dependable option for light-duty construction and repair work, such as positioning tub surrounds, sealing around sinks and tubs, and securing polystyrene foam in place.

For more demanding jobs, F-26® Construction Adhesive offers long-lasting durability and unmatched versatility. It’s designed to perform in challenging conditions and delivers a strong, flexible bond—even in extreme environments. Common applications include:

• Installing subfloors and flooring materials
• Tackling exterior projects such as masonry, concrete, pavers, and decks
• Bonding fiberglass and fiberboard
• Securing metal components like studs, brackets, thresholds, moldings, electrical boxes, and nameplates
• Mounting garage door hardware and stair treads

Sealant or Adhesive for Construction?

When it comes to choosing between a sealant vs adhesive, it’s essential to understand how each product performs under different conditions. Factors like movement, moisture, material type, and the strength required all influence which product is the better fit for the job.

When it comes to deciding between sealant vs adhesive, consider your specific project demands. Here are a few key considerations to guide your decision:

• The Environment: If your application involves high heat, moisture, UV exposure, or chemicals, a flexible product like a sealant may be the better choice. Sealants are designed to flex and adapt as conditions shift—helping maintain a lasting seal over time.
• Materials: Always consult the manufacturer’s recommendations to ensure compatibility with the surfaces you’re working with. There are adhesives and sealants formulated for nearly every material combination.
• Strength Requirements: Think about whether you need a rigid, permanent bond or a flexible seal that allows for some movement. Adhesives are typically used when a strong, immovable hold is needed, while sealants are better for joints or seams that may expand, contract, or vibrate.

Always look beyond the label when choosing sealant vs adhesive for your project. Consider the ingredients, the manufacturer’s recommended use, and the durability of the product. A strong, reliable outcome depends on using the right product for the job.

Sealants and Adhesives Built to Perform

At Leech Adhesives, we offer a wide range of professional-grade sealants and adhesives designed to meet the demands of real-world construction—from moisture-prone interiors to tough outdoor environments. Whether you’re bonding subfloors, installing tile, or sealing joints, our products are engineered for strength, durability, and lasting performance.

Not sure which solution is right for your job? Contact our team for expert guidance, and we’ll help you find the best fit for your materials, environment, and project goals.

Need technical help or product recommendations? Contact us with your questions.

Stick with Leech. One Brand, Every Bond.

You purchased construction glue expecting a simple application process you could rely on, but that did not happen. Adhesive not sticking is a common problem, but it can be frustrating even for seasoned pros. 

Numerous potential causes exist for adhesive failure to occur, and all of them are avoidable when you purchase high-quality construction glue products and follow the manufacturer’s instructions for proper application.

Common Causes of Adhesive Failure

Construction and industrial adhesives are designed to offer exceptional durability and reliability. But even the best products can fail—especially when not applied correctly. Modern formulations are stronger than ever, but success still depends on how well the instructions are followed.

If you’re facing adhesive not sticking, here’s a breakdown of what might be going wrong—and how to fix it.

Surface Prep Problems: The First Step That Can’t Be Skipped

Before anything sticks, the surface needs to be clean, dry, and ready to bond.

• Clean thoroughly – Remove debris, dust, old adhesive, and any contaminants.
• Abrade when necessary – Some surfaces may require light sanding or roughening for better grip.
• Avoid over- or under-prepping – Too much abrasion can weaken the surface; too little won’t allow proper bonding.

Tip: Always check the adhesive manufacturer’s application guidelines. Improper prep is one of the top reasons for failure.

Our F-26® formula requires minimal surface prep. It’s jobsite-ready, even when your surface isn’t.

The Moisture Issue: More Than Just a Little Water

Moisture can ruin a bond—before, during, or after application.

• Direct moisture exposure – Wet surfaces during application prevent adhesives from grabbing properly.
• Humidity matters – High humidity can infiltrate adhesive layers, reducing performance.
• Damp environments – Consistent exposure to moisture post-application can degrade the bond over time.
  

Solution: Use moisture-resistant or waterproof adhesives, like Leech F-26®, designed for damp conditions and outdoor use.

Using F-26®? Good news—our high-performance construction adhesive is built for jobsite realities, staying strong even in the presence of moisture and water. 

Extreme Environmental Changes: The Invisible Adhesive Killers

Environmental fluctuations can wreak havoc on adhesive performance.

• Sudden temperature spikes can cause adhesive to soften or shrink.
• Rapid cooling may make bonds brittle and prone to cracking.
• Gaseous exposure (changes in oxygen or CO₂ levels) can affect curing and integrity—especially in enclosed or industrial settings.
  

Prevention: F-26® is engineered for performance across a wide temperature range—from 0°F to 120°F application, and -20°F to 150°F service. Whether it’s freezing, scorching, or both in a single week, F-26® stays strong, flexible, and dependable.

The Cure Can Be the Problem 

Rushing the job? That might be why your adhesive is peeling or failing.

Common curing problems:

• Inadequate airflow or ventilation during the cure
• Incorrect temperature range
• Not allowing enough curing time
• Applying pressure too soon or too late
• Skipping manufacturer’s curing recommendations
  

Result: Without proper curing, even the strongest adhesive can’t form a reliable bond.

Improper Application: Wrong and Uneven is Always Wrong

Even great adhesive fails if applied incorrectly.

Avoid these mistakes:

• Using the wrong amount of adhesive
• Applying it unevenly or in the wrong areas
• Using the wrong adhesive for the surface or conditions

Trowel application is not recommended for fast-drying adhesives. Use a caulking gun, spatula, or knife to distribute adhesive evenly across the surface. 

Rule of thumb: Read the label. Then re-read it. Different adhesives have very specific needs.

How to Fix Weak Adhesive Bonds

If something went wrong, here’s how to bounce back:

1. Start fresh If possible – Remove old adhesive, prep correctly, and reapply using the right process.
2. Choose a better fit – Select an adhesive suited to the surface, environment, and application type.
3. Adjust your process – Whether it’s curing, prepping, or applying—something needs tweaking.
   

The Right Adhesive Deserves the Right Application

Proper surface prep, environmental awareness, and curing care make all the difference in bond strength and longevity.

Using professional-grade adhesives like F-26® means you’re starting with a reliable product that requires minimal prep! 

Because when you’re building something to last—failure isn’t an option, and neither is poor prep.

Stick with Leech. One Brand, Every Bond.