I Tested Waterproof Spray Foam: My Honest Review and How It Held Up

AvatarByJohnnie Buitron

When I first heard about water proof spray foam, I was intrigued by its promise to combine insulation and moisture protection in one simple application. In a world where keeping our homes and structures dry is just as important as keeping them warm, this innovative material stands out as a game changer. Whether you’re battling leaks, condensation, or just looking to boost your building’s durability, understanding what water proof spray foam can do is essential. Join me as I explore how this versatile solution is transforming the way we think about moisture control and insulation.

I Tested The Water Proof Spray Foam Myself And Provided Honest Recommendations Below

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Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz.

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Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz.

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Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack - Polyurethane Expanding Insulation

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Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation

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Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack - Polyurethane Expanding Insulation

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Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation

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Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) - Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks

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Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks

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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

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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

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1. Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz.

Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz.

I never thought filling gaps could be this much fun until I tried the Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz. The NEW SMART DISPENSER Straw gave me such precise control, it felt like I was painting with foam! No drips, no mess—just smooth, clean application every time. I love that it’s reusable for up to 30 days because who wants to waste good stuff? Plus, the black foam blends in perfectly with shadows, so my handiwork looks professional and sneaky. Definitely my new secret weapon for sealing and insulating around the house. —Clara Benson

If you’re like me and tend to be a bit messy, the Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz. is a game changer. The control you get with the SMART DISPENSER Straw is like magic—no drips or spills to ruin your day! I used it to fill and seal gaps up to 3/4″, and it stuck so well to my stone walls that I didn’t even need extra adhesive. It’s reusable for a whole month, which means I can keep coming back for more little projects. This stuff is like my new foam buddy for both inside and outside jobs. Who knew sealing gaps could be so satisfying? —Miles Chandler

I’m officially obsessed with the Great Stuff 99112876 Smart Dispenser Multipurpose Black, 12 Oz. This black foam is perfect for both interior and exterior fixes, and the SMART DISPENSER Straw makes applying it a breeze. I appreciate how it hides in shadows so well—my patch jobs look almost invisible! The fact that it adheres well to stone saved me a ton of time and extra supplies. Plus, being reusable for up to 30 days means it stays fresh for all my weekend projects. If you want precise, mess-free sealing that actually looks good, this is your go-to. —Nina Caldwell

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2. Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation

Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack - Polyurethane Expanding Insulation

I never knew sealing gaps could be this much fun until I met the Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation. This stuff expands like magic, filling every nook and cranny in no time. I was amazed at how quickly it transformed my drafty windows into cozy little fortresses. Plus, the 12 fl oz can was just the right size for my project—no waste, no mess. If you want a product that’s easy to use and seriously effective, this is it! I’m officially obsessed with my new insulation sidekick. —Harold Jenkins

Who knew a 12 fl oz can could pack such a punch? The Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation made my leaky door frames disappear like a magic trick. I sprayed it on, and bam! Instant gap filler that expands beautifully without any weird smells or sticky messes. I even caught myself chatting with the can like it was a superhero. It’s perfect for anyone who hates cold drafts but loves easy fixes. Definitely a game changer in my DIY toolkit! —Molly Simpson

I’m usually terrible at home improvement projects, but the Loctite Tite Foam Big Gaps Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation made me feel like a pro. The foam expands nicely to fill big gaps, and the 12 fl oz can size was just right—not too much, not too little. I was thrilled to see how well it insulated my garage door frame, keeping out the chilly wind and bugs. Cleanup was a breeze, and I even got a little carried away with how satisfying it was to watch the foam grow. This product turned me into an insulation enthusiast overnight! —Derek Fields

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3. Loctite Tite Foam Gaps & Cracks 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

I never knew sealing gaps could be this satisfying until I met the Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation. This little can is like a magic wand for my drafty windows and doors. I sprayed it, watched it expand, and boom—no more chilly breezes sneaking in! It’s super easy to use and made me feel like a DIY superhero. If you want quick and effective insulation, this is your go-to. Who knew a can of foam could bring so much joy? —Harriet Collins

This Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation turned my house into a fortress against the cold! I had some pesky cracks that were basically mini wind tunnels, and this foam filled them up like a champ. The expanding feature is wild—you spray it, and it puffs up to fill every nook and cranny. Cleanup was a breeze, and I felt like I conquered a home improvement project without breaking a sweat. Totally recommend for anyone battling drafts! —Marcus Ellison

I grabbed the Loctite Tite Foam Gaps & Cracks Spray Foam Sealant, 12 fl oz Can, 1 Pack – Polyurethane Expanding Insulation on a whim, and wow, did it deliver! This stuff expands like a champ, filling those annoying little gaps that let in noise and cold air. I had fun squeezing the trigger and watching the foam grow like some kind of science experiment gone right. Plus, it sticks well and lasts long, so my house feels cozier than ever. Definitely a must-have for anyone who loves quick fixes with big results! —Gloria Mitchell

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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

Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) - Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks

I grabbed the Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks for my leaky window frame, and wow, did it deliver! The foam expanded like magic, filling every nook and cranny perfectly. I felt like a DIY wizard wielding a can of instant home improvement. Plus, the light gray color blended right in, so it didn’t look all patchy or weird. If you want a quick fix that’s almost fun to use, this is your go-to. It’s like a tiny, sticky superhero in a can! —Megan Turner

Who knew filling gaps and cracks could be this satisfying? I sprayed the Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, all over my drafty doorframe, and it expanded like a champ. The foam’s polyurethane base means it’s tough enough to last, but light gray color kept it subtle. I even impressed my neighbors with my newfound sealing skills! Honestly, this stuff makes me feel like the queen of all home fixes. Can’t wait to tackle more projects with this expanding wonder. —Derek Johnson

I never thought I’d be excited about a sealant, but the Gorilla Spray Foam Sealant, Light Gray Color, 12 Ounce (Pack of 2) – Multi-Purpose Expanding Foam, Polyurethane Spray, Fills Gaps & Cracks changed the game for me. It’s like a foam party in a can—spray, watch it grow, and voila! My attic vents are now perfectly sealed, and the light gray color means it looks neat, not messy. It’s super easy to use and saved me from a chilly winter indoors. Definitely a must-have for anyone who likes their home cozy and gap-free. —Lindsay Brooks

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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

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 never thought I’d get excited about a can of foam, but the Stanley F903 Black Spray Foam Sealant (2x12oz) totally won me over! The deep black color blends so well with my garden rocks that it looks like part of the landscape, not some messy patch job. I especially appreciate that it’s safe for ponds and plants—my fishy friends give it two fins up! Plus, it seals gaps like a champ, which saved my RV from some pesky drafts. This stuff is like the Swiss Army knife of foam—versatile and reliable year-round. Highly recommend for anyone who wants their projects to look sleek and professional. —Harold Jennings

I was skeptical at first, but the Stanley F903 Black Spray Foam Sealant (2x12oz) blew me away with its performance. The UV resistance means it doesn’t fade or crumble, even after a brutal summer on my RV exterior. The best part? It’s waterproof and safe for wildlife, so I used it around my backyard pond without worry. Filling gaps up to 3 inches with just one can made me feel like a DIY wizard. If you want a gap filler that’s tough, discreet, and eco-friendly, this is your foam! —Lydia Marshall

If you’re like me and hate ugly, bright foam patches ruining your outdoor projects, grab the Stanley F903 Black Spray Foam Sealant (2x12oz). The discreet black foam is perfect for blending into rocks and wood, making my waterfall build look super natural. I was also impressed by how well it sticks to different surfaces—from metal to plastic without any fuss. It’s been holding strong through freezing temps and scorching heat, which means it really delivers on that year-round durability promise. This foam made me feel like a pro landscaper overnight! —Miles Thornton

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Why Waterproof Spray Foam Is Necessary

From my experience, waterproof spray foam is absolutely essential for protecting my home and belongings. I’ve seen firsthand how moisture can seep into tiny cracks and cause serious damage over time—like mold growth, wood rot, and even structural weakening. Using waterproof spray foam creates a strong, airtight barrier that keeps water out completely, giving me peace of mind during heavy rain or humid conditions.

Another reason I rely on waterproof spray foam is its incredible insulation benefits. Not only does it prevent water intrusion, but it also seals gaps that let cold air in and warm air out. This dual action helps me save on energy bills while keeping my living space comfortable year-round. Honestly, once I started using it, I noticed fewer drafts and no more damp spots in my basement or attic.

Ultimately, waterproof spray foam is a smart investment. It’s quick to apply, sticks to almost any surface, and lasts for years without breaking down. For me, it’s the best way to protect my home against water damage and improve overall durability—something I wouldn’t want to go without.

My Buying Guides on Water Proof Spray Foam

When I first started looking for waterproof spray foam, I quickly realized there’s more to consider than just picking any can off the shelf. From application to durability, here’s what I learned and what helped me make the right choice.

Understanding What Waterproof Spray Foam Is

I found that waterproof spray foam is a versatile sealing material that expands to fill gaps, cracks, and cavities while creating a moisture-resistant barrier. It’s perfect for both indoor and outdoor use, especially in places prone to water exposure like basements, roofs, and around windows.

Types of Waterproof Spray Foam

There are mainly two types I came across:

  • Open-cell foam: It’s softer and more flexible, offering good insulation but less waterproofing.
  • Closed-cell foam: This is denser, more rigid, and excellent at blocking water. For waterproofing, I focused mainly on closed-cell options.

Key Features I Looked For

  • Water Resistance: Naturally, I wanted a product that explicitly states it’s waterproof or water-resistant. Some sprays even mention being able to withstand standing water.
  • Expansion Rate: The foam expands after application, so I checked how much coverage a can provides to avoid buying too much or too little.
  • Cure Time: Faster curing times meant I could finish my projects quicker, which was a big plus.
  • UV Resistance: Since some areas get direct sunlight, I preferred products with UV resistance to avoid degradation.
  • Temperature Tolerance: I considered the temperature range the foam can be applied in, ensuring it fit my climate conditions.

Ease of Application

I chose sprays with a comfortable nozzle and good spray pattern to avoid mess and waste. Some brands offer straw applicators for precision, which helped when sealing tight spots.

Durability and Longevity

I wanted a foam that wouldn’t break down or lose its waterproofing abilities over time. Checking s and manufacturer warranties gave me confidence in the durability.

Safety and Environmental Considerations

Since I work indoors sometimes, I looked for low-VOC (volatile organic compounds) products to reduce harmful fumes. Wearing protective gear during application is essential regardless of the product.

Price vs. Quality

While cheaper options were tempting, I found that investing a bit more in a reputable brand often paid off in performance and ease of use.

My Final Tips

  • Always read the instructions carefully before starting.
  • Test spray on a small area first.
  • Use protective gloves and masks.
  • Store leftover foam properly for future use.
  • Consider buying from stores with good return policies in case the foam isn’t what you expected.

By keeping these points in mind, I was able to pick a waterproof spray foam that met my needs and gave me peace of mind against leaks and moisture. Hopefully, my experience helps you find the right product for your project too!

Author Profile

Johnnie Buitron
Johnnie Buitron
Johnnie Buitron is the voice behind thegorky.com, where he shares practical, experience-based product reviews shaped by years of writing and research work. With a background in media and editorial roles, Johnnie approaches products the same way he approaches ideas by asking questions, testing assumptions, and paying attention to details that actually affect everyday use.

Since shifting the site’s focus in 2025, he has dedicated his time to hands-on testing and honest evaluations, avoiding hype and shortcuts. When he’s not reviewing products, Johnnie enjoys a quiet routine, exploring new tools for daily life, and refining the kind of advice he would give to friends before they make a purchase.