--- product_id: 684403191 title: "6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit)" brand: "fiberglass supply depot" price: "918 zΕ‚" currency: PLN in_stock: true reviews_count: 5 url: https://www.desertcart.pl/products/684403191-6-lb-density-expanding-pour-foam-2-part-polyurethane-closed store_origin: PL region: Poland --- # Expands 4x volume rapidly Closed-cell foam for soundproofing 6 lb density for max buoyancy 6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) **Brand:** fiberglass supply depot **Price:** 918 zΕ‚ **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Expand your projects, not your worries! ## Quick Answers - **What is this?** 6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) by fiberglass supply depot - **How much does it cost?** 918 zΕ‚ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/684403191-6-lb-density-expanding-pour-foam-2-part-polyurethane-closed) ## Best For - fiberglass supply depot enthusiasts ## Why This Product - Trusted fiberglass supply depot brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Rock-Solid Buoyancy:** 6 lb density ensures unmatched flotation and durability for marine and dock applications. - β€’ **Rapid Expansion Power:** Expands up to 4 times its liquid volume in under 60 secondsβ€”get the job done fast, no waiting. - β€’ **DIY-Proven Reliability:** Trusted by pros and hobbyists alike for carving, mold-making, and structural reinforcement. - β€’ **Precision Void Filling:** Aggressively adheres and fills gaps, cracks, and cavities with a tough, long-lasting seal. - β€’ **Versatile Soundproofing & Insulation:** Closed-cell polyurethane blocks noise and seals thermal leaks for a quieter, energy-efficient space. ## Overview This 1-gallon 2-part polyurethane foam kit delivers a dense 6 lb closed-cell foam that rapidly expands 4x its liquid volume, providing superior buoyancy, soundproofing, insulation, and void filling. Ideal for boats, docks, and DIY projects requiring durable, moisture-resistant sealing and structural support. ## Description 6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) : desertcart.co.uk: DIY & Tools Review: Works great for my taxidermy molds Expands roughly 4 times liquid amount and is rock solid ( 6lb ) Review: I used this product to pour through a small hole into an area that an animal was attempting to dig under my deck. It expands pretty rapidly and you need to get it poured as fast as you can after mixing it. You have maybe a 60 second working time before it takes off. It expands very rapidly and voluminously. It filled the area with decently hard cured material. Just don't put it someplace fragile and confined, it will very happily push out thin wood on its way to full expansion. The end material seems acceptably durable. It builds a thin skin on itself and it's not easy to rip apart or dislodge. The resultant material also sticks aggressively to anything, so make sure you are ok with that. Also, don't get the pre-cured material on your hands; it sticks extremely well to human skin and it will be a pain to get off. Overall a great product for filling spaces! ## Features - Causes skin irritation. - Harmful if inhaled. - May cause allergy or asthma symptoms or breathing difficulties if inhaled. - May cause an allergic skin reaction. - May cause damage to organs (respiratory tract) through prolonged or repeated exposure (if inhaled). - May cause respiratory irritation. - Soundproofing, Insulation, Buoyancy ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BBH4XQ9P | | Best Sellers Rank | 462,235 in DIY & Tools ( See Top 100 in DIY & Tools ) 403 in Expanding Foams | | Brand | Fiberglass Supply Depot | | Colour | Clear | | Compatible Material | Polyester, Epoxy, Vinyl Ester Resin, Wood, Metal, Plastic, Ceramic, Glass, Rubber, Stone, Fiberglass, Faux Leather, Fabric, Paper, Cardboard, Gemstone | | Container Type | Gallon | | Customer Reviews | 4.4 4.4 out of 5 stars (175) | | Full Cure Time | 5 Minutes | | Global Trade Identification Number | 00819794023221 | | Item Form | Liquid, Solid | | Item Package Quantity | 1 | | Item Volume | 128 Fluid Ounces | | Item Weight | 6 Pounds | | Manufacturer | Fiberglass Supply Depot Inc. | | Material | Resin | | Model Number | FBACPOLY6LBGK | | Other Special Features of the Product | Soundproofing, Insulation, Buoyancy | | Specific Uses For Product | Boats, Dock Flotation, Soundproofing, Filling Voids, Insulation | | Unit Count | 1.0 count | | Viscosity | Low | | Water Resistance Level | Not Water Resistant | ## Product Details - **Brand:** Fiberglass Supply Depot - **Item form:** Liquid, Solid - **Material:** Resin - **Special feature:** Soundproofing, Insulation, Buoyancy - **Specific uses for product:** Boats, Dock Flotation, Soundproofing, Filling Voids, Insulation ## Images ![6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) - Image 1](https://m.media-amazon.com/images/I/81Do0u1pU6L.jpg) ## Questions & Answers **Q: could this me used for settng fence posts?** A: This foam is very strong & it will bond doesn't soak in ground I would not be afraid to use as a fence post filler. **Q: Will this skin inside a mold? Self skinning without direct air or moisture exposure for casting.** A: No this will not set up without air **Q: What is the shelf life of this product?** A: Approximately 6 months from the manufacture date. **Q: Will this work for archery targets?** A: Yes this foam will expand to fill in shot out areas on a foam target you can sand flush once it hardens let it set up for about an hour ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by Z***N on 26 November 2025* Works great for my taxidermy molds Expands roughly 4 times liquid amount and is rock solid ( 6lb ) ### ⭐⭐⭐⭐⭐ Review *by B***S on 16 August 2024* I used this product to pour through a small hole into an area that an animal was attempting to dig under my deck. It expands pretty rapidly and you need to get it poured as fast as you can after mixing it. You have maybe a 60 second working time before it takes off. It expands very rapidly and voluminously. It filled the area with decently hard cured material. Just don't put it someplace fragile and confined, it will very happily push out thin wood on its way to full expansion. The end material seems acceptably durable. It builds a thin skin on itself and it's not easy to rip apart or dislodge. The resultant material also sticks aggressively to anything, so make sure you are ok with that. Also, don't get the pre-cured material on your hands; it sticks extremely well to human skin and it will be a pain to get off. Overall a great product for filling spaces! ### ⭐⭐⭐⭐⭐ Review *by A***Y on 4 October 2025* Worked great. Easy to mix, poured well, and got into all the holes. I had an hole in the base layer under some concrete that also has pavers on top. The concrete has shifted and no matter how much sand I used to backfill the cracks- the pavers keep shifting as well. I used this, and after a heavy rainy season, the pavers and concrete still have not moved. ## Frequently Bought Together - 6 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boats, Dock Flotation, Carving, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) - Custom Shop Paint Mixing Cups Plastic Measuring Cup Epoxy Resin, Disposable or Reusable, 32-Ounce Quart - Pack of 12 - Graduated, Mixing Ratios, Automotive Painting Acrylic Art Crafts Kitchen - 4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/684403191-6-lb-density-expanding-pour-foam-2-part-polyurethane-closed](https://www.desertcart.pl/products/684403191-6-lb-density-expanding-pour-foam-2-part-polyurethane-closed) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-01*