
Waterproof foam spray sealant is a game-changer for anyone looking to add insulation and protection to their home or building.
It's a simple, yet effective solution that can be used on a wide range of surfaces, including wood, metal, and drywall.
This versatile sealant is also easy to clean up, making it a convenient option for DIY projects and professional applications alike.
One of the key benefits of waterproof foam spray sealant is its ability to expand up to 30 times its original size, providing a tight seal and preventing water and air leaks.
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Product Information
This waterproof foam spray sealant is a great solution for sealing gaps and cracks in various surfaces. It's a type of polyurethane-based sealant that expands to fill gaps and then dries to a flexible foam.
It's available in various sizes, ranging from 10 oz to 20 oz, making it easy to choose the right size for your project. The sealant can be applied to surfaces such as wood, metal, and plastic.
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It's suitable for use in a variety of applications, including sealing gaps around windows and doors, and filling cracks in walls and floors. This sealant is also resistant to mold and mildew growth.
It dries quickly, usually within 1-2 minutes, and can be painted over once dry. The sealant is also flexible, allowing it to move with the surface it's applied to.
Choosing the Right Sealant
SPRAYMAN offers specialized solutions for every type of sealing project, so you can find the best match for your specific application.
The type of sealant you need depends on the size and location of the gap or crack. For larger areas, consider using the 24 oz gun foam, while the 12 oz straw applicator is great for precise sealing.
To choose the right foam sealant, explore our lineup and consider the following options:
- SPRAYMAN Gaps & Cracks Filler Foam: Ideal for walls, floors, and attics, it delivers strong adhesion and effective moisture protection.
- SPRAYMAN Pest Blocker Foam: Contains EPA-registered pesticide for pest prevention and is available in both straw and gun versions.
- SPRAYMAN Window & Door Foam: A low-expansion foam designed for tight spaces around door and window frames.
- SPRAYMAN Fire Block Foam Sealant: Applied as fireblock foam for your fireproof insulation needs and is available in both straw and gun versions.
How to Choose?
Choosing the right sealant can be overwhelming, especially with all the options available. Consider the specific application you need the sealant for, as different types of sealants are designed for different tasks.
SPRAYMAN offers specialized solutions for every type of sealing project, so explore their lineup to find the best match for your needs. For example, if you need to seal cracks and joints, you may want to consider the SPRAYMAN Gaps & Cracks Filler Foam.
This versatile foam delivers strong adhesion and effective moisture protection, making it ideal for walls, floors, and attics. If you're looking for a sealant that's specifically designed for tight spaces around door and window frames, SPRAYMAN Window & Door Foam is a great option.
Gun grade Polyurethane sealant is also a great choice, especially for door frame fitment. This type of sealant is designed for lower expansion and high bond strength, which ensures a secure fit without exerting pressure on the door frame.
Here's a comparison of different sealant options from SPRAYMAN:
Ultimately, the right sealant for you will depend on your specific needs and preferences. Take the time to research and compare different options to find the one that best fits your project.
Why Choose Sealants?
Choosing the right sealant can be a bit overwhelming, but let's break it down. One of the main reasons to choose sealants is that they help maintain consistent indoor temperatures.
This is especially important for areas that require heat and flame resistance, like kitchens or commercial spaces. This feature supports safety and can be a lifesaver in emergency situations.
Sealants also improve energy efficiency and reduce utility bills, which is a win-win for your wallet. By blocking drafts and noise, they enhance overall comfort and make your space feel cozier.
Here are some key benefits of sealants at a glance:
- Helps maintain consistent indoor temperatures.
- Improves energy efficiency and reduces utility bills.
- Prevents moisture-related issues like mold and mildew.
- Enhances overall comfort by blocking drafts and noise.
- Supports safety in areas that require heat and flame resistance.
- Offers lasting durability in both indoor and outdoor conditions.
- Easy to apply with minimal tools or professional assistance.
Overall, sealants offer a range of benefits that make them a worthwhile investment for your project.
Usage and Application
Waterproof foam spray sealant is designed to fill gaps, holes, and penetrations to prevent drafts, water, noise, and pest intrusion. It's a reliable solution for both indoor and outdoor applications, providing protection against moisture and the elements.
To use PU foam spray effectively, make sure to fix the nozzle firmly on the tip of the application gun, with no clearance between the nozzle and the gun. This will prevent leakage of foam during the application process.
For optimal results, shake the can for at least 20 times before application. Then, adjust the application pressure to your desired level by tightening or loosening the screw located at the back side of the gun.
The ideal application distance for PU foam spray is between 40-45 cm from the surface. Applying the foam too close or too far from the surface can result in decreased performance, so aim for this sweet spot for best results.
For ceiling applications, hold the gun and product vertically and apply the foam from an average distance of 15-20 cm. This will help you achieve the optimal application thickness of 1.5 cm per layer, which is essential for maintaining the heat and sound insulation value of the foam.
What Is Used For?

Foam sealant is a versatile product that can be used to fill gaps, holes, and penetrations to prevent drafts, water, noise, and pest intrusion.
It's amazing how much of a difference it can make in keeping your home or building comfortable and secure. Foam sealant is especially useful in areas where traditional caulk or adhesives just won't do the trick.
Foam sealant is designed to provide reliable protection against moisture and the elements, making it perfect for outdoor applications.
How to Use PU Spray
To use PU foam spray effectively, start by firmly attaching a nozzle to the application gun, making sure there's no clearance between the two to prevent leakage.
Shake the can for at least 20 times to mix the contents properly.
Adjust the application pressure by tightening or loosening the screw at the back of the gun, and aim to wind it up to the end for normal conditions.
Apply the polyurethane foam insulation spray at a distance of 40-45 cm from the surface, as getting too close or far away can result in uneven thickness and reduced insulation value.
For ideal application, maintain a thickness of 1.5 cm per layer, and aim for three layers with some overlap to achieve optimal heat and sound insulation.
Conversely, applying the spray from too great a distance can result in thinner coverage and increased consumption.
For ceiling applications, hold the gun and product vertically and apply from an average distance of 15-20 cm.
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Gap Filling Benefits
Polyurethane foam insulation sealant offers a strong sound, heat, and water insulation, contributing to heat insulation and decreasing the heating/cooling costs of buildings.
It has high resistance against many solvents, particularly water after being cured, which also contributes to the water insulation of buildings.
Thanks to its high acoustic insulation property, it absorbs sound and offers peaceful living spaces.
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The joint doesn't crack with time due to expansion & contraction, unlike traditional methods.
Lower labour cost is achieved due to the fast process, and higher productivity is also a benefit.
Overall, the cost is lower compared to traditional methods.
Here are the key benefits of gap filling PU foam sealant:
- Faster process, time saving
- Reduction in Labour cost
- Excellent aesthetics, no cracks developed with time
- Additional strength provided to door frame, number of anchor fasteners can be reduced
- Highly efficient thermal insulation guaranteed
- Efficient sealing at lower cost
- Ease of application
- 100% electrical insulation and waterproofing
Technical Details
To get the best results from your waterproof foam spray sealant, you need to understand the technical details behind its application.
Firstly, make sure to firmly fix the nozzle on the tip of the application gun for vertical floors, with no clearance between the nozzle and the gun. Any leakage during application will be a real nuisance.
Shaking the can for at least 20 times before application is crucial to ensure the foam is properly mixed. This step can't be skipped, so be sure to do it thoroughly.
The ideal distance for applying the foam spray is between 40-45 cm from the surface. Getting too close or too far away can affect the application thickness and overall performance.

For ceiling applications, hold the gun and product vertically and apply the foam at an average distance of 15-20 cm. This will ensure an even and effective seal.
To achieve optimal heat and sound insulation, aim for a thickness of 1.5 cm on a single layer. Applying more than this can actually decrease the insulation value, so it's better to stick to the recommended amount.
For thicker applications, consider applying in 3 layers with some overlap to achieve the desired performance. This will help maintain the insulation value and ensure a proper seal.
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Outdoor Use and Durability
Our waterproof foam spray sealant is designed to withstand the elements, making it perfect for outdoor use. You can rely on its reliable protection against moisture and the elements.
It's great for sealing gaps and cracks in outdoor areas like decks, patios, and walkways. The sealant is designed to keep water out and provide a durable seal.
You can use it to seal joints and seams in outdoor furniture, such as wooden benches and tables. This will help prevent water damage and extend the life of your furniture.
The sealant is also suitable for use in areas with high humidity and temperature fluctuations. This makes it a great choice for outdoor applications in tropical or coastal regions.
It's easy to apply and dries quickly, allowing you to get back to your outdoor projects in no time.
Insulation and Polyurethane
Polyurethane foam insulation sealant offers a strong sound, heat, and water insulation, contributing to heat insulation and decreasing heating/cooling costs of buildings.
It absorbs sound and provides peaceful living spaces thanks to its high acoustic insulation property. This makes it ideal for homes and buildings where noise reduction is a priority.
Polyurethane foam insulation sealant has high resistance against many solvents, including water after being cured, making it an excellent choice for water insulation of buildings.
It provides increased structural strength to the door frame due to its high bonding strength, allowing for a reduction in the number of anchor fasteners used for fixing the door frame.
This flexible sealant doesn't crack with time due to expansion and contraction, unlike traditional methods. It's also not rigid like white cement or putty, making it a more reliable option.
Here are some key benefits of using polyurethane foam insulation sealant:
- Lower labor cost due to fast process
- Higher productivity
- Overall lower cost
Polyurethane Insulation Spray vs Traditional Methods
Polyurethane insulation spray offers a strong sound, heat, and water insulation, which can significantly reduce heating and cooling costs in buildings.
Using polyurethane foam insulation sealant technology can provide a peaceful living space due to its high acoustic insulation property, which absorbs sound.
Its high resistance against many solvents, particularly water after being cured, also contributes to the water insulation of buildings.
Polyurethane foam insulation sealant provides increased structural strength to the door frame due to its high bonding strength, allowing you to reduce the number of anchor fasteners used for fixing the door frame.
Unlike traditional methods, polyurethane foam insulation sealant is not rigid, so the joint doesn't crack with time due to expansion and contraction.
Polyurethane foam insulation sealant is a fast process, resulting in lower labor costs and higher productivity.
Here are some key benefits of using polyurethane foam insulation sealant:
- Strong sound, heat, and water insulation
- High acoustic insulation property
- High resistance against many solvents, particularly water
- Increased structural strength to the door frame
- Non-rigid, reducing the risk of cracking
- Lower labor costs
- Higher productivity
- Can be cut, sanded, painted, and has a better finish than traditional methods
- Overall lower cost
Overall, polyurethane foam insulation sealant offers a range of benefits that make it a superior choice to traditional methods.
What Is Good Polyurethane Insulation
So, you're looking for good polyurethane insulation. A high-density polyurethane foam insulation sealant is ideal, with a density of 25-30 Kg/m3. This ensures it won't shrink under load.
The output of foam generated per 750 ml can is approximately 30 meters, covering a joint length with 750 ml can. However, this may vary depending on the gap width and depth between the door frame and wall.
A good polyurethane foam insulation sealant should have a cellular structure of 70% closed cells. This helps with its insulating properties.
When choosing a product, make sure the 750 ml can weighs at least 830 gms. Some cheap products may fill lesser PUF in the can to reduce price.
It's also essential to consider the skin formation time, which should be around 8-10 minutes. This affects the overall productivity of the application process.
2 Answers
The spray foam can be used to fill larger voids near the exterior, but it's essential to cover any exposed foam to prevent degradation from sunlight.
You should be certain that the water is coming from outside and not condensation on the AC lines, as sealing a hole may just seal condensation in the wall.
If the problem is condensation, the pipes should be covered with foam insulation, and then the foam can be used to seal the opening at the exterior.
Some spray foams, like Loctite, have UV resistance, but it's not a guarantee among all products.
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To provide additional waterproofing and protection to the foam, caulking can be applied on top of it.
Gaping holes should be eliminated, not filled, as spray foam will degrade in sunlight and soak up water.
You can even flush cut the foam and then paint it to create a seamless finish.
Painting or covering the foam with exterior-grade caulk can help prevent degradation.
Here are some options for filling holes:
- Spray foam with UV resistance (Loctite, for example)
- Henry 212 ("Crystal Clear" sealant)
- Silicone caulk (leftover from another project)
Frequently Asked Questions
Is there such a thing as waterproof expanding foam?
Yes, waterproof expanding foam exists and is designed to create a strong, waterproof seal that can withstand harsh conditions. The Deligo Water-Proof Expanding Foam is a great example of this type of product, offering a reliable solution for various applications.
Is Great Stuff foam sealant waterproof?
No, GREAT STUFF products are water-resistant, not waterproof. They may become waterlogged and lose their structure if exposed to water for an extended period
Sources
- https://www.homedepot.com/p/GREAT-STUFF-12-oz-Gaps-and-Cracks-Insulating-Spray-Foam-Sealant-227112/202893728
- https://sprayman.co/collections/foam-sealant
- https://diy.stackexchange.com/questions/282772/is-spray-foam-suitable-for-a-waterproof-seal-around-ac-lines-through-external-wa
- https://supex.in/product/pu-foam-spray/
- https://supex.in/foam-spray/
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