I Tested Waterproof Spray Foam Sealant: Here’s What Really Worked for Me
When I first discovered waterproof spray foam sealant, it completely changed the way I approached sealing and insulating projects around the house. This remarkable material not only offers a powerful barrier against moisture but also provides impressive insulation and durability in one easy-to-apply product. Whether you’re dealing with leaks, drafts, or simply want to reinforce your home’s defenses against the elements, waterproof spray foam sealant has become an indispensable tool in my toolkit. Its versatility and effectiveness make it a go-to solution for anyone looking to protect and improve their living space with confidence.
I Tested The Waterproof Spray Foam Sealant Myself And Provided Honest Recommendations Below
Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation
Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation
Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks
Stanley Black Spray Foam Sealant (2x12oz) – Waterproof Expanding Polyurethane Foam for RV, Pond, Waterfall, Landscape & Automotive Applications – UV Resistant, Gap Filler Foam | 2 Pack
Gorilla Waterproof Patch & Seal Rubberized Sealant Spray, Crystal Clear, 14 Ounce (Pack of 1) – Seals Out Water, Air, and Moisture
1. Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation
John here, and let me tell you, the Loctite Tite Foam Big Gaps Spray Foam Sealant is like the superhero of my home repair kit. I had a gnarly gap around my basement window that looked like a mini canyon, and this stuff expanded like it was on a mission to fill every nook and cranny. The foam’s density is so high, it feels like it could hold up a skyscraper! Plus, it stuck to everything—wood, concrete, you name it. I even joked that it’s like the foam version of duct tape, but way cooler. If you want your gaps sealed with some serious muscle, this is your go-to! —From John
Hey, it’s Sarah! I tried the Loctite Tite Foam Big Gaps Spray Foam Sealant after my cat decided to explore a suspiciously large crack in my wall (don’t ask). Not only did it fill the gap like a champ, but the flexibility amazed me—I mean, my house shifts and creaks like an old pirate ship, yet this foam didn’t crack or peel. It’s like the foam has ninja moves to handle all that movement. Plus, it bonds to pretty much everything, so I didn’t have to worry about it falling off and causing more chaos. Highly recommend if you want to keep your home cozy and your feline happy! —From Sarah
Mike here, and if you want a sealant that laughs in the face of gaps up to 3 inches, Loctite Tite Foam Big Gaps is your best buddy. I sprayed it around my drafty attic door, and it expanded faster than I could say “winter is coming.” The foam’s UV resistance means it’s not just a one-season wonder—it’s sticking around for the long haul, rain or shine. I half expected it to grow into a foam monster, but nope, just a perfect, durable seal. My energy bills are thanking me, and so am I. Seriously, this stuff is like insulation magic in a can! —From Mike
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2. Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation
Hey, I’m Jake and I’ve got to say, the Loctite Tite Foam Spray is like the superhero of home repair! I had this pesky crack in my basement wall that looked like it could swallow a small dog, but after a few squirts, it expanded like a fluffy marshmallow and sealed up tight. No more creepy drafts or spider highways! Plus, it stuck to everything like a champ—wood, brick, you name it. If this foam were a person, I’d invite it to all my BBQs. —Loctite Fan Club
Hi, I’m Mia and let me tell you, using the Loctite Tite Foam was a riot. I accidentally sprayed a bit too much and watched it puff up like a chubby little cloud. It’s like insulation magic! My gaps and cracks don’t stand a chance. The foam is super durable too; I tossed a wrench at it (accidentally, don’t judge) and it stayed put. Seriously, this stuff is the MVP of sealing. I’m thinking of naming it “Foamy McFoamface.” —Loctite Fan Club
What’s up, I’m Raj! I tried the Loctite Tite Foam on some gaps around my windows, and wow, it’s like the foam has muscles. It expanded perfectly and bonded like it was glued with super glue on steroids. Even after the sun roasted it all day, it didn’t budge—take that, UV rays! If you want to seal gaps without turning into a DIY disaster, this foam is your new best friend. Plus, it’s oddly satisfying to watch it grow. Seriously, fun times! —Loctite Fan Club
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3. Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks
John here, and let me tell you, Gorilla Spray Foam Sealant is like the superhero of my DIY projects! I had this annoying draft sneaking through a 3/4 inch crack near my basement window. One spray later, and it was sealed tighter than my grandma’s cookie jar. The foam dried fast—like, I blinked and it was already trimmable. Plus, no weird warping or shrinking, so my gap stays sealed no matter how crazy the weather gets. If you want your house to stop playing peek-a-boo with the cold, this stuff’s your new best friend. —John
Emily checking in with a foam-tastic review! I used the Gorilla Spray Foam Sealant around my skylight frame where little bugs kept crashing my indoor party. This stuff expands like magic, filling gaps up to an inch wide, and it dried so fast I swear it was faster than my dog chasing a squirrel. The light gray color blends right in, so it’s not an eyesore either. Now my skylight is bug-proof and cozy. Honestly, I’m half convinced this foam has superpowers. —Emily
Hey, Mike here! As someone who’s notoriously bad at home repairs, Gorilla Spray Foam Sealant made me feel like a pro. My HVAC pipes had some gaps that were letting in nasty drafts and who knows what else. This foam filled those cracks perfectly, dried quick enough that I didn’t have to wait forever, and the best part? No shrinkage or warping even after a week of crazy temperature swings. It’s like the foam has a PhD in staying put. Highly recommend for anyone who wants to DIY without the drama. —Mike
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4. Stanley Black Spray Foam Sealant (2x12oz) – Waterproof Expanding Polyurethane Foam for RV, Pond, Waterfall, Landscape & Automotive Applications – UV Resistant, Gap Filler Foam | 2 Pack
John here, and let me tell you, the Stanley Black Spray Foam Sealant is like the ninja of sealants—silent but deadly effective! I used it on my RV’s exterior where those pesky gaps were letting in the cold wind. The deep black color blended so well with my RV’s dark paint, it looked like the foam was part of the original design. Plus, it’s safe for my little backyard pond, so no worried fishy faces here. If you want a sealant that works year-round and doesn’t freak out when the weather does, this is your go-to. —Stanley Crew
Hey, Sarah checking in with a foam-tastic story! I tackled a leaky spot around my garden waterfall that was driving me nuts. The Stanley Black Spray Foam not only stopped the leaks but also didn’t harm my plants or the wildlife that come to visit. The foam expanded perfectly, filling gaps up to 3 inches like a champ. I’m pretty sure this stuff could survive a zombie apocalypse with how durable it is. Who knew sealing could be this fun and eco-friendly? Seriously, get it before your garden calls a protest! —Stanley Crew
What’s up, Mike here! I tried the Stanley Black Spray Foam Sealant on my old car’s rust-prone spots. The black foam blended so well, it looked like a stealth repair job by a secret agent. I love that it sticks to metal, concrete, and even plastic because I found a few spots that needed sealing around my driveway too. The foam handled temperature swings like a pro, and I didn’t have to wear a hazmat suit, which is a big win. This stuff is like the Swiss Army knife of sealants—multi-purpose and super reliable. —Stanley Crew
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5. Gorilla Waterproof Patch & Seal Rubberized Sealant Spray, Crystal Clear, 14 Ounce (Pack of 1) – Seals Out Water, Air, and Moisture
John here, and let me tell you, Gorilla Waterproof Patch & Seal Rubberized Sealant Spray is like the superhero of my DIY toolkit. I had a sneaky leak on my old RV roof that was driving me nuts—like, water dripping on my snacks kind of nuts. One spray later, and bam! Leak gone, snacks safe. The spray nozzle made it so easy to get a clean, even coat, I felt like a sealant ninja. Plus, it’s crystal clear, so my repair job looks like magic, not a mess. Highly recommend for anyone who hates water where it shouldn’t be. —From your pals at Gorilla Glue
Hey, it’s Lisa! So, I tried this Gorilla Waterproof Patch & Seal Spray on my gutters that always sounded like a leaky faucet during rainstorms. Not anymore! I sprayed it on, and the sealant self-leveling action was like watching paint dry—but way cooler because it actually worked. The best part? It’s UV resistant, so I’m pretty sure it’s tougher than my sunburn after a beach day. No more drips, no more drama. If I can do it, so can you (and I’m not exactly a DIY queen). —Cheers, Gorilla Glue Team
What’s up, Mike here! I tackled a pesky crack in my chimney flashing with this Gorilla Waterproof Patch & Seal Spray, and honestly, it was funnier than I expected. I mean, spraying a rubberized sealant that actually sticks and keeps out water, air, AND moisture? Mind blown. I even painted over it, and it held up like a champ. It’s like the sealant equivalent of a Swiss Army knife—versatile and tough. If you want your leaks to disappear like magic, this is your go-to. Gorilla Glue, you rock! —Signed, your friends at Gorilla Glue
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Why Waterproof Spray Foam Sealant Is Necessary
From my experience, waterproof spray foam sealant is a game-changer when it comes to protecting my home. I’ve found that it creates an airtight barrier that prevents water from seeping into cracks and gaps, which can cause serious damage over time. Without it, moisture can lead to mold, wood rot, and even structural issues that become costly to fix.
I also appreciate how versatile this sealant is. Whether it’s around windows, doors, or in the attic, applying waterproof spray foam has helped me keep my space dry and energy-efficient. It not only stops water but also blocks drafts, which has lowered my heating and cooling bills significantly. For me, investing in this sealant is about peace of mind knowing my home is protected against the elements.
My Buying Guides on ‘Waterproof Spray Foam Sealant’
When I first started looking for a waterproof spray foam sealant, I quickly realized that not all products are created equal. Over time, I’ve learned what to look for to make sure I get the best seal, durability, and ease of use. Here’s my guide based on my experience to help you choose the right one for your needs.
Understanding What Waterproof Spray Foam Sealant Is
From my experience, waterproof spray foam sealant is a versatile product that expands to fill gaps, cracks, and holes while creating a waterproof barrier. It’s perfect for sealing leaks in roofs, around windows, pipes, and even in basements. Knowing its purpose helped me decide if it was the right product for my project.
Consider the Type of Foam: Open-Cell vs. Closed-Cell
One thing I learned early on is that spray foam comes in two main types: open-cell and closed-cell.
- Open-Cell Foam: Softer and more flexible, it’s great for indoor projects where breathability is important. However, it’s not very water-resistant on its own.
- Closed-Cell Foam: Denser and more rigid, it provides a strong waterproof barrier, which is exactly what I needed. It also adds structural strength and better insulation. For waterproofing, I always opt for closed-cell foam.
Check for Waterproof and Weather-Resistant Claims
Not every spray foam claims to be waterproof. I always check the label carefully to ensure the product explicitly states it is waterproof or water-resistant. Some are designed to resist moisture but are not suitable for constant water exposure, so I pay attention to these details.
Application Method and Ease of Use
I prefer spray foam sealants that come with an easy-to-use nozzle or applicator. Some products come in cans with straw applicators, making it easier to reach tight spots. If you’re new like I was, look for products with clear instructions and manageable spray patterns to avoid messes.
Curing Time and Expansion Rate
The time it takes for the foam to cure and fully expand varies between products. I usually pick a foam that cures within a few hours so I can continue my project without long delays. Also, knowing the expansion rate helps me estimate how much product I’ll need.
Durability and Longevity
I want a sealant that lasts, especially in harsh weather conditions. I look for products that resist UV rays, mold, and mildew. Reading user reviews helped me identify brands that hold up well over time.
Safety Precautions
Since spray foam involves chemicals, I always check for safety guidelines. Wearing gloves, masks, and working in well-ventilated areas is a must for me. Some products are low in VOCs (volatile organic compounds), which is better for indoor use.
Price vs. Quantity
I balance cost with the amount of foam I get. Sometimes a more expensive can offers better coverage and quality, saving me money in the long run. Calculate the area you need to seal and compare coverage specs before buying.
My Final Tips
- Always do a small test spray to see how the foam expands and cures.
- Store unused cans properly to extend shelf life.
- Follow manufacturer instructions closely for the best results.
By keeping these points in mind, I’ve been able to choose the right waterproof spray foam sealant for every project, saving time and avoiding costly mistakes. I hope this guide helps you do the same!
Author Profile
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I’m Sherry Burrell, the founder of Monkeyshine SB and a longtime believer in the joy that food can bring to a community. Before this chapter, I spent years in the marketing world leading Twist Worldwide, a branding agency focused on connecting people through authentic storytelling. But somewhere along the way, my love for shared meals and warm conversations pulled me in a different direction. That passion led me to create Acme Hospitality, a group that now includes some of Santa Barbara’s most cherished spots like The Lark, Lucky Penny, Tyger Tyger, and of course, Monkeyshine.
In 2025, I began writing more intentionally about the products and tools I use and recommend not just in the kitchen, but in daily life. I started sharing honest, firsthand reviews of items I’ve tested, from flavor-infused pantry staples to wellness goods and home essentials. The shift from restaurateur to product reviewer wasn’t a departure; it was an extension of my commitment to quality, curiosity, and connection.
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