Stanley F903 Black Foam Sealant, 12 oz - Waterproof Adhesive for Waterfalls, Landscaping, RVs & Construction - UV Resistant - 2 Pack
Stanley F903 Black Foam Sealant, 12 oz - Waterproof Adhesive for Waterfalls, Landscaping, RVs & Construction - UV Resistant - 2 Pack
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STANLEY

Stanley F903 Black Foam Sealant, 12 oz - Waterproof Adhesive for Waterfalls, Landscaping, RVs & Construction - UV Resistant - 2 Pack

|2 ratings
Stanley F903 Black Foam Sealant, 12 oz - Waterproof Adhesive for Waterfalls, Landscaping, RVs & Construction - UV Resistant - 2 PackStanley F903 Black Foam Sealant 12 oz Waterproof Adhesive for Waterfalls Landscaping RVs Construction UV Resistant 2 PackStanley F903 Black Foam Sealant 12 oz Waterproof Adhesive for Waterfalls Landscaping RVs Construction UV Resistant 12 PackStanley F903 Black Foam Sealant 12 oz Waterproof Adhesive for Waterfalls Landscaping RVs Construction UV Resistant 1 Pack
Size2 Pack

Key item features

  • WATERPROOF & MOLD-PROOF: It maintains reliable seals in moisture-prone environments such as ponds, waterfalls, and RV exteriors, preventing leaks and mold growth.
  • UV & WEATHER RESISTANCE: It withstands direct sunlight and temperature extremes, ensuring year-round durability and protection against cracking or discoloration.
  • MULTI-PURPOSE APPLICATION: It is perfect for use as a waterfall and pond foam, RV insulation and sealing, automotive undercarriage protection, and general construction or HVAC sealing tasks.
  • EASY APPLICATION: It comes in a ready-to-use 12 oz straw canister that applies easily and expands smoothly to fill gaps up to 3 inches.
  • SUPERIOR ADHESIVE PERFORMANCE: It provides strong bonding and sealing on diverse materials such as concrete, stone, wood, metal, and plastic, ensuring long-lasting results in both indoor and outdoor projects.
  • FAST-CURING FORMULA: It becomes tack-free in approximately 7 minutes, helping you complete projects faster and minimize downtime.
  • ECO-FRIENDLY & UL CERTIFIED: It contains no ozone-depleting substances, is UL certified for safety and quality, and is safe for use around aquatic life, plants, and wildlife-ideal for environmentally sensitive landscaping.

Specs

Industrial sealant type, Polyurethane FoamRec. use, Fill Gaps, Seal JointsRecommended surface, Multi-SurfaceDry time, 7 minRec location, Indoor and OutdoorBrand, STANLEY

About this item

Product details

Stanley F903 Black Foam Sealant is a professional-grade expanding polyurethane foam designed for superior sealing, bonding, and insulation in landscaping, waterfall, RV, automotive, and construction applications.

Its deep black color blends naturally into outdoor environments and visible surfaces, ensuring a clean, professional finish. This high-performance foam delivers exceptional adhesion to stone, concrete, metal, wood, and other common materials-ideal for creating durable, waterproof, and UV-resistant seals.

Quick-curing and mold-proof, Stanley F903 offers long-lasting performance even in wet or humid areas, while its eco-friendly formula contains no ozone-depleting propellants and is safe around ponds, plants, and wildlife.

Perfect for DIY and professional use alike.

  • WATERPROOF & MOLD-PROOF: It maintains reliable seals in moisture-prone environments such as ponds, waterfalls, and RV exteriors, preventing leaks and mold growth.
  • UV & WEATHER RESISTANCE: It withstands direct sunlight and temperature extremes, ensuring year-round durability and protection against cracking or discoloration.
  • MULTI-PURPOSE APPLICATION: It is perfect for use as a waterfall and pond foam, RV insulation and sealing, automotive undercarriage protection, and general construction or HVAC sealing tasks.
  • EASY APPLICATION: It comes in a ready-to-use 12 oz straw canister that applies easily and expands smoothly to fill gaps up to 3 inches.
  • SUPERIOR ADHESIVE PERFORMANCE: It provides strong bonding and sealing on diverse materials such as concrete, stone, wood, metal, and plastic, ensuring long-lasting results in both indoor and outdoor projects.
  • FAST-CURING FORMULA: It becomes tack-free in approximately 7 minutes, helping you complete projects faster and minimize downtime.
  • ECO-FRIENDLY & UL CERTIFIED: It contains no ozone-depleting substances, is UL certified for safety and quality, and is safe for use around aquatic life, plants, and wildlife-ideal for environmentally sensitive landscaping.
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Specifications

Industrial sealant type

Polyurethane Foam

Rec. use

Fill Gaps, Seal Joints

Recommended surface

Multi-Surface

Dry time

7 min

Warranty

Warranty information

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Customer ratings & reviews

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Showing 1-2 of 2 reviews

Oct 4, 2026
Reviewer name: Sandee
Top Reviewer
Item details
Size: 2 Pack
Sold and shipped byLotus Global
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

worked for what we needed

used it to fill in holes in car, the painter over with black spray paint, and it blended very well.

Incentivized Review
Helpful?4KMBVWN9D9DX18441400648
Jul 24, 2026
Reviewer name: Carrie
Top Reviewer
Item details
Size: 2 Pack
Sold and shipped byLotus Global
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Aquatic safe

Used in reef aquarium to create aquascape barnacle wall on eggcrate. Filled all gaps. Held everything in place, No issues with drying and 1 can goes a long way.

Incentivized Review
Helpful?4KMBVWN9D9DX18441400648
Current price is $26.99
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Sold and shipped by Lotus GlobalPro Seller
4.565714285714286 out of 5 stars
4.6 stars out of 5, based on 175 seller reviews(4.6)
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