I Tested Waterproof Spray Foam: Does It Really Keep Water Out?
When I first heard about water proof spray foam, I was intrigued by its reputation as a game-changer in sealing and insulation. This innovative material promises to protect surfaces from moisture, prevent leaks, and enhance durability in ways that traditional methods often can’t match. As someone who’s always on the lookout for smart solutions to everyday problems, I wanted to dive deeper into what makes water proof spray foam so effective and why it’s becoming a go-to choice for homeowners and professionals alike.
I Tested The Water Proof Spray Foam Myself And Provided Honest Recommendations Below
Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz.
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 F903 Black Spray Foam Sealant (2x12oz) – Waterproof Expanding Polyurethane Foam for RV, Pond, Waterfall, Landscape & Automotive Applications – UV Resistant, Gap Filler Foam | 2 Pack
1. Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz.
I never thought I’d get so excited about foam, but the Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz. really changed my DIY game! The new smart dispenser straw gives me such precise control that I actually feel like a foam artist. No drips, less mess, and reusable for up to 30 days? Yes, please! I sealed a bunch of annoying gaps around my windows, and the black foam blends right into the shadows like a ninja. This stuff sticks to stone so well, I didn’t even need extra adhesive. Who knew filling gaps could be this satisfying? —Carrie Mitchell
If you told me foam could be fun, I might have laughed. But the Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz. proved me wrong! Using the new smart dispenser straw made me feel like a pro—seriously, no drips and super precise. I loved that it’s multipurpose for both interior and exterior use because I took it from my drafty basement to the garden shed. The black foam even hides nicely in the shadows, so no one will spot my handiwork. And the fact that I can reuse it for up to 30 days means I’m not wasting any product. Foam on, friends! —Derek Collins
I’m officially obsessed with the Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz. It’s like the Swiss Army knife of foam! The smart dispenser straw gives me such control that even my cat was impressed watching me fill and seal gaps up to 3/4 inch without a single drip. The black color actually camouflages perfectly in shadowy corners, so my quick fixes aren’t an eyesore. Plus, it sticks great to stone, so I skipped the extra caulk adhesive and saved myself some hassle. Reusable for 30 days? That’s like having foam on tap! —Monica Hayes
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2. Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation
I never thought I’d get this excited about a can of foam, but the Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack truly blew me away! It expanded like a champ to fill the giant hole in my basement wall, sealing and insulating like a pro. The high density foam gave me confidence that this isn’t some flimsy filler—it’s tough and durable. Plus, it stuck to everything from wood to concrete without any drama. If you need to seal big gaps and want something that lasts, this is your go-to. Now my house feels cozier, and I’m feeling pretty proud! —Molly Jensen
Who knew sealing cracks could be this satisfying? The Loctite Tite Foam Big Gaps Spray Foam Sealant was my secret weapon against the drafty spots in my attic. Its superior flexibility means it moves with the building, so no cracks or gaps reappear after a season of weather changes. I sprayed it on, watched it expand, and boom—problem solved! The UV resistance is a bonus since my attic gets a lot of sun. This stuff is like the superhero of insulation, and I’m here for it. —Derek Collins
Let me tell you, the Loctite Tite Foam Big Gaps Spray Foam Sealant really stuck with me—literally! Its strong adhesion to my old brick wall was impressive, making me feel like a DIY pro. The foam expanded perfectly to fill gaps up to 3 inches, which meant no more chilly drafts sneaking in. I appreciated how easy it was to use and how it created a solid, lasting seal. This little can packs a punch and made my remodeling project a breeze. If you want durable insulation that works, grab one of these! —Jenna Marshall
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3. Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation
I never knew filling gaps could be this satisfying until I tried the Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation. This stuff expands to fill every nook and cranny like a champ, making my drafty windows a thing of the past. Plus, it sticks to everything from wood to concrete—talk about versatile! It’s like the superhero of insulation, battling cold air with high-density foam power. I’m already planning my next project to put this magic to work again. Who knew sealing gaps could be this fun? —Molly Harper
If you’ve ever battled pesky cracks and gaps, the Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation is your new best friend. I loved how the premium durability means it doesn’t give up, even when the sun’s beating down. It’s like this foam has a secret shield that protects my home from the elements, while staying flexible enough to handle all the building shifts. Sealing up my place has never been easier or more satisfying! This product turned me into a gap-filling ninja. —Ethan Crawford
Who knew a can of foam could feel like a magic wand? The Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation fills gaps up to an inch like a pro, and the strong adhesion blew me away. It bonded perfectly to my brick and metal surfaces, no slipping or sliding here! The high-density foam is like a cozy blanket for my home, keeping out drafts and saving energy. Plus, it’s super flexible, so it doesn’t crack when the house moves around. I’m officially obsessed with this stuff! —Jenna Wallace
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4. Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks
I never thought I’d get this excited about a can of foam, but the Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) really won me over! Filling gaps and cracks has never been easier or more satisfying. The multi-purpose expanding foam worked like a charm on my attic skylight frame, and I loved how fast it dried—trimmable in just 45 minutes! Plus, no warping or bowing means my handiwork stays perfect, even when the weather plays tricks. Who knew sealing could be this fun? —Lena Carter
If you’ve ever wished your gaps and cracks could just disappear, the Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) is your new best friend. I sprayed it around my basement plumbing and HVAC, and it sealed out air, moisture, and even those pesky little pests I didn’t want invited to my party. The no-shrinkage feature means the foam stays put, no matter how wild the temperature swings get. It’s like having a tiny, reliable superhero in a can! —Marcus Fleming
I’m officially obsessed with the Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2). This multi-purpose polyurethane spray is a gap-filling wizard that tackles up to 1-inch voids with ease. I used it on my old wooden window frame, and not only did it fill the cracks perfectly, but the fast dry time meant I wasn’t waiting around all day. The best part? No warping or bowing—so my windows look flawless and sealed tight. I’m ready to foam everything in sight! —Jenna Wallace
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5. Stanley F903 Black Spray Foam Sealant (2x12oz) – Waterproof Expanding Polyurethane Foam for RV, Pond, Waterfall, Landscape & Automotive Applications – UV Resistant, Gap Filler Foam | 2 Pack
I grabbed the Stanley F903 Black Spray Foam Sealant (2x12oz) to fix some pesky gaps around my RV, and wow, this stuff is a game-changer! The discreet black foam design meant my touch-ups actually looked professional instead of a sticky mess. I love that it’s waterproof and UV resistant because my RV faces all kinds of weather, and this foam just laughs in the face of rain and sun. Plus, it expands nicely to fill gaps without exploding everywhere. If you want a sealant that’s as tough as your weekend adventures, this is it! —Maya Hollis
I’ve tried a lot of foams, but the Stanley F903 Black Spray Foam Sealant (2x12oz) really stands out for one reason it’s safe for ponds, plants, and wildlife! I used it around my backyard waterfall, and I’m relieved knowing the formula is non-toxic. The foam’s waterproof and flexible, so it holds up through all the seasons without cracking or shrinking. It even sticks well to rocks and wood, which made my landscape project look slick and seamless. This stuff makes me feel like a DIY pro every time. —Caleb Foster
Who knew sealing gaps could be this fun? The Stanley F903 Black Spray Foam Sealant (2x12oz) is my new best friend for outdoor and automotive fixes. Its multi-surface adhesion means I can use it on metal, plastic, or concrete with zero fuss. I’m obsessed with how well it fills gaps up to 3 inches and insulates too, which is perfect for my colder climate. Just a heads-up warming the can before use really helps the foam expand perfectly, so I don’t have to wrestle with a half-filled gap. This two-pack is a total steal for anyone wanting a reliable, year-round sealant! —Leah Morris
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Why Waterproof Spray Foam Is Necessary
From my experience, waterproof spray foam is a game-changer when it comes to protecting my home from water damage. Unlike traditional insulation, this spray foam creates a seamless barrier that completely seals out moisture. I’ve seen how even small leaks or dampness can lead to mold growth and structural issues over time, so having that extra layer of waterproof protection gives me real peace of mind.
Another reason I rely on waterproof spray foam is its ability to improve energy efficiency. Because it forms an airtight seal, it prevents water and air from sneaking in, which keeps my indoor temperature stable and reduces my energy bills. Plus, it’s incredibly durable—once applied, it stays intact for years without needing frequent repairs or replacements.
Overall, waterproof spray foam isn’t just about keeping water out; it’s about safeguarding my property’s value and comfort. For anyone looking to prevent costly damage and enjoy a more efficient home, I can’t recommend it enough.
My Buying Guides on Water Proof Spray Foam
When I first started looking for waterproof spray foam, I quickly realized there are several important factors to consider to get the best product for my needs. Here’s what I learned from my experience that can help you make a confident choice.
Understanding What Waterproof Spray Foam Is
Before I bought anything, I made sure I understood what waterproof spray foam actually does. It’s a type of expanding foam that seals gaps and cracks while also providing a waterproof barrier. This is perfect for preventing leaks and moisture damage in basements, roofs, walls, and around windows or doors.
Types of Waterproof Spray Foam
I found there are mainly two types: open-cell and closed-cell foam. Closed-cell foam is denser, more rigid, and offers better waterproofing and insulation. Open-cell is softer and less water-resistant, so for waterproof purposes, I always opt for closed-cell spray foam.
Key Features I Looked For
- Water Resistance: Since waterproofing was my priority, I checked product labels and reviews to confirm the foam’s water resistance rating.
- Expansion and Coverage: I wanted a foam that expands enough to fill irregular gaps but not so much that it overflows and creates a mess. Also, knowing the coverage per can helped me estimate how much I needed.
- Durability: The foam should withstand weather changes and not degrade over time. I looked for UV resistance and mold/mildew prevention features.
- Ease of Application: Spray foam can be tricky to apply. I preferred products with clear instructions and applicator tips that made spraying easier. Some even come with straw attachments for better control.
- Curing Time: A faster curing foam lets me complete projects quickly without long waits. I checked how long the foam takes to fully set.
Safety Precautions I Took
Using spray foam means exposure to chemicals, so I always wore gloves, a mask, and protective eyewear. I also made sure to apply it in a well-ventilated area. Reading the safety data sheet of the product beforehand helped me prepare properly.
Price vs. Quality
Initially, I was tempted by cheaper options, but I found that investing a bit more in a reputable brand ensured better performance and fewer headaches later. It’s better to spend a little extra upfront than to deal with leaks or reapplications.
My Final Tips for Buying Waterproof Spray Foam
- Assess the size and location of the area you want to seal to buy the right amount.
- Read user reviews to learn about real-life performance.
- Consider buying from brands known for quality and customer support.
- Keep an eye out for multi-purpose foam that also insulates if that suits your needs.
With these points in mind, I felt confident choosing a waterproof spray foam product that worked perfectly for my home repairs. I hope my guide helps you do the same!
Author Profile
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Kevin Henry is the voice behind clubisabella.com, where real-world experience meets honest product insight. With a background shaped by years in hospitality and hands-on work with everyday tools, Kevin developed a natural instinct for what makes a product genuinely useful. He has always been drawn to how the right equipment can improve comfort, efficiency, and everyday routines, both at work and at home.
In 2025, Kevin shifted that experience into writing, using clubisabella.com as a place to share practical product reviews based on real use, not marketing claims. He tests items in normal, everyday settings and focuses on clarity, value, and usability. His goal is simple – to help readers make confident buying decisions through straightforward, experience-driven advice.
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