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
$16.99
Price: $16.99
(as of Sep 25, 2025 02:54:20 UTC – Details)
Tackle tough sealing tasks with confidence using Stanley Black Spray Foam Sealant – a professional-grade, expanding polyurethane foam engineered for outdoor and indoor applications. This waterproof and UV-resistant black foam is ideal for RV maintenance, pond and waterfall construction, landscape projects, and automotive sealing, delivering long-lasting performance in harsh conditions. Formulated for superior adhesion, this high-expansion foam bonds quickly to a variety of materials including stone, concrete, wood, metal, and plastic. The deep black color blends naturally into landscaping and black piping, while its fast-curing formula ensures minimal wait time between application and finishing. Safe for use around plants and aquatic life, Stanley Black Foam is highly durable, paintable, and effective in sealing gaps, cracks, joints, and voids up to 3 inches wide. Whether you’re building, sealing, or repairing, it offers a reliable barrier against air infiltration and environmental damage.
Product Dimensions : 3 x 6 x 8 inches; 2.47 Pounds
Date First Available : April 7, 2025
Manufacturer : StanleyChem
ASIN : B0F3Y1P51V
Best Sellers Rank: #2,225 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #9 in Urethane Adhesives
Customer Reviews: 4.4 4.4 out of 5 stars 128 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
DISCREET BLACK FOAM DESIGN: Deep black color blends naturally into rock features, landscaping, and RV exteriors—ideal for creating clean, professional-looking seals in visible outdoor or automotive areas.
YEAR-ROUND PERFORMANCE & DURABILITY: Engineered to perform reliably across all seasons with excellent resistance to UV, and temperature extremes. Maintains a strong seal even in fluctuating climates.
SAFE FOR PONDS, PLANTS & WILDLIFE: Non-toxic and waterproof formula is safe for aquatic use and landscaping. Perfect for sealing in environmentally sensitive spaces without compromising safety.
MULTI-SURFACE, HIGH-YIELD SEALANT: Adheres to stone, concrete, metal, wood, and plastic—ideal for RV maintenance, pond building, landscape design, and more. Fills gaps up to 3” with excellent insulation and sealing properties. Apply between 41°F and 86°F for best results. For cold weather, allow the can to reach room temperature (~68°F) to ensure full expansion and adhesion performance.
SAFE FOR PONDS, PLANTS & WILDLIFE: Non-toxic and waterproof formula is safe for aquatic use and landscaping. Perfect for sealing in environmentally sensitive spaces without compromising safety.
UL Certified Safety: This product is UL certified, meeting the highest standards of safety and quality. Designed for your peace of mind.
Customers say
Customers find the foam sealant effective at filling gaps and appreciate its quality. However, they find it really hard to use. The expansion capacity receives mixed feedback, with several customers noting it expands at least 3x its size.
8 reviews for 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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$16.99
MT –
Foam expands and fills large gaps. It gets firm enough to keep mice out of any openings
Worked perfectly to seal a gap where AC tubing entered my house. Easy application, make sure you wear gloves and an old shirt when you apply. The product is inherently messy but the foam expands and fills gaps nicely. It is sticky, so gloves and paper towel essential. It is a low cost solution for a larger gap; small gaps better treated with caulking or similar.
Jo –
Great Stuff
Works great used it to seal baseboards to keep mice out. Sp far so good
kSthwrth –
Works. Easy to use.
Works great. Note: this stuff really expands. So plan for that when you apply it.
Amber Barelia –
Great foam spray
I genuinely love this product. I have a roach infestation and couldn’t find anything to block these wall and cabinet holes. This does the job. Foams alot and sticks adequately. However there are a few downsides but nothing to not buy this product.–It of course has a strong chemical smell, use ventilation and a fan when using this.–It is very sticky and gooey- so use very long gloves, I use regular bathroom cleaning cloves that go to the elbow. It is definitely necessary to get gloves to the elbow.–It dries surprisingly quick only an hour.–I have huge gaps underneath my cabinets and it filled those. However since it is underneath the cabinet, it just kept falling to the floor I did sections of spraying and used a trash bag for the floor. It peels off very easy once it dries so if it gets on your floor let it dry don’t try to pick it up. Then peel it off.–when dried, it has the consistency of a pool noodle.– Kind if easy for a beginner beginner but I got the hang of it by the end. I think the best way to use it for holes is to kind of keep the nozzle in the same spot after spraying for a while especially for upside down holes.Anyways, it definitely blocks the holes and hopefully the roaches will stop living. I’m definitely buying more!!!Pictures are of aftermath. its VERY messy only because I’m not an expert…
Christine Gallagher –
Great product
It did the job and you donât need to use a lot!
VLADY –
Good for sealing cracks
Good for sealing walls Crack on concrete or wood wall
KM –
Hard to cut, doesn’t stay put very well. Fills holes, but nothing you want showing.
Really expensive for what you get. It does the job, but you’re gonna need both cans to do much filling.I used it to fill a crack around the bottom of a wall I’m prepping for paint, but it was a mess. I knew it would be, so I taped off the floor, so I could peel it back up clean after I cut away the excess. It did not cut well. I used a razor knife, MANY TIMES, to try to cut it free, but It ended up coming off in chunks, often taking the part I wanted to stay, with it. The tape came up, but not well. It’s seemingly impossible to get a clean cut from the floor.The filler expanded like crazy in the open air, with giant bubbles, but the stuff in the crack also had a ton of bubbles, too, so no painting over that. You’d need to fill all the voids with putty, or calk, etc. Even then, half of it tried to come out with the stuff I’d tried to cut off, so this was pretty much an expensive waste of time for my purpose.I’ve used similar stuff in the past, to fill holes where critters & cold air were getting into the house, & because I didn’t care what it looked like, I just left it alone. It did work for that. I just wouldn’t use it on anything that shows. It does not cut well, and the voids are ridiculous in size, even in tight quarters, and it really didn’t stick well, either, and kept trying to come out, every time I touched it.
Ronald Wieck –
Effective Product
Fast delivery