--- product_id: 273973809 title: "- 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)" brand: "fiberglass supply depot" price: "1823 kr" currency: DKK in_stock: true reviews_count: 13 category: "Fiberglass Supply Depot" url: https://www.desertcart.dk/products/273973809-4-lb-density-expanding-pour-foam-2-part-polyurethane-closed store_origin: DK region: Denmark --- # 2 cubic feet coverage per kit 5 min full expansion time 4 lb density for superior flotation - 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) **Brand:** fiberglass supply depot **Price:** 1823 kr **Availability:** ✅ In Stock ## Summary > 🚀 Float, Fill, and Fortify with Foam That Means Business! ## Quick Answers - **What is this?** - 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) by fiberglass supply depot - **How much does it cost?** 1823 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/273973809-4-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 - • **Rapid Expansion, Zero Wait:** Expands fully in just 5 minutes to save your project time. - • **Optimized for Professionals:** Best used at 75-80°F with a quick 45-second working window—engineered for expert control. - • **Resin-Compatible Durability:** Can be laminated with polyester, epoxy, or vinyl ester resins without melting or damage. - • **Versatile Application Power:** Ideal for flotation, soundproofing, insulation, and sculpting—one kit, endless possibilities. - • **Precision Mix for Perfect Results:** Two-part polyurethane formula ensures consistent, reliable performance every pour. ## Overview Fiberglass Supply Depot’s 4 lb density expanding pour foam is a high-performance, two-part polyurethane closed-cell foam kit delivering 2 cubic feet of durable, versatile material. Designed for boat and dock flotation, soundproofing, insulation, and filling voids, it cures quickly within 5 minutes and bonds seamlessly with common resins. Perfect for professionals demanding precision, speed, and multi-functional use in one powerful kit. ## Description Buy Fiberglass Supply Depot 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): Urethane Adhesives - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Good product. - Works well. Be quick and ready for it, it expands quickly and will come for you if you're not prepared to control it. Review: Works great - Works great , quick set up and easy to use ## Features - Flotation Foam is a polyurethane 2-part foam that, when mixed in equal parts and poured in place this foam will soundproof, insulate, or provide extra buoyancy. - 4LB. Density polyurethane flotation Foam 1 Gallon Kit; Consists of 1/2 gallon of Part A and 1/2 gallon of Part B and produces 2 cubic feet. - Once fully cured this foam can be laminated over with any type of polyester, epoxy or vinyl ester resin without melting. - The 4LB density also works well in floating decoy or taxidermy applications as well as many other sculpting, casting, carving and other filling applications - All expansion rates and times given are temperature critical. Temperatures below 75° F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75° to 80° F or above. Accurate measuring of these products is extremely critical. Working time before foaming: approx. 45 seconds Time before full expansion: approx. 5 minutes ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08T2195F8 | | Best Sellers Rank | #30,574 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #57 in Urethane Adhesives | | Brand Name | Fiberglass Supply Depot | | Coverage | 2 cubic feet | | Customer Reviews | 4.5 4.5 out of 5 stars (250) | | Manufacturer | Fiberglass Supply Depot Inc. | | Material Type | Foam,Resin | | Recommended Uses For Product | Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting | | UPC | 819794022934 | | Unit Count | 192 Fluid Ounces | ## Product Details - **Brand:** Fiberglass Supply Depot - **Manufacturer:** Fiberglass Supply Depot Inc. - **Material:** Foam,Resin - **Recommended Uses For Product:** Flotation, Soundproofing, Insulation, Filling Voids, Sculpting, Casting - **UPC:** 819794022934 ## Images ![- 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) - Image 1](https://m.media-amazon.com/images/I/81ySuM57MmL.jpg) ## Questions & Answers **Q: What is the compressive strength of the foam, in PCF?** A: They only give the compressive strength in PSI and that is 78 for the 4lb foam **Q: What is the viscosity of the liquids before they mix?** A: The best way to describe it would be like warm pancake syrup. **Q: i'm new at this..what does density mean i see 2lb..4lb..6lb? thanks** A: Think of it as hardness or strength. The 2lb will be more sponge like 6 will be harder. **Q: Can you use pole foam to insulate the walls of a shop? Does it go thru a heat? Will it blister the tyvek or metal on the outside?** A: It doesn't fill a very big volume like spray foam. It is very liquid and comes out of any cracks. Will set up hard as a rock though. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good product. *by R***H on March 8, 2025* Works well. Be quick and ready for it, it expands quickly and will come for you if you're not prepared to control it. ### ⭐⭐⭐⭐⭐ Works great *by J***D on May 28, 2025* Works great , quick set up and easy to use ### ⭐⭐⭐⭐⭐ Good *by K***Y on December 20, 2025* It arrived broken, but they replaced it. I give it 5 stars because the product is super good for my boat; it's excellent. Thank you. ## Frequently Bought Together - 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) - 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 - 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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/273973809-4-lb-density-expanding-pour-foam-2-part-polyurethane-closed](https://www.desertcart.dk/products/273973809-4-lb-density-expanding-pour-foam-2-part-polyurethane-closed) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-23*