--- product_id: 733261437 title: "2lb Density Expanding Cast Foam, 2-Piece Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Sound Insulation, Filling Gaps and Insulation (1 Gallon Kit)" brand: "fiberglass supply depot" price: "€ 422.52" currency: EUR in_stock: true category: "Fiberglass Supply Depot" url: https://www.desertcart.at/products/733261437-2lb-density-expanding-cast-foam-2-piece-polyurethane-closed-cell store_origin: AT region: Austria --- # 45 sec working time, 5 min full expansion 2lb density for optimal buoyancy 5 cubic feet coverage per 1-gallon kit 2lb Density Expanding Cast Foam, 2-Piece Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Sound Insulation, Filling Gaps and Insulation (1 Gallon Kit) **Brand:** fiberglass supply depot **Price:** € 422.52 **Availability:** ✅ In Stock ## Summary > 🛠️ Float, Fill, and Fortify—Foam That Works as Hard as You Do! ## Quick Answers - **What is this?** 2lb Density Expanding Cast Foam, 2-Piece Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Sound Insulation, Filling Gaps and Insulation (1 Gallon Kit) by fiberglass supply depot - **How much does it cost?** € 422.52 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/733261437-2lb-density-expanding-cast-foam-2-piece-polyurethane-closed-cell) ## 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 - • **Marine-Grade Durability:** Complies with US Coast Guard safety standards and bonds with polyester, epoxy, or vinyl ester resins without melting. - • **Rapid Expansion Formula:** Mix equal parts and watch it expand fully in just 5 minutes—perfect for fast, efficient projects. - • **Precision Buoyancy Boost:** 2lb density closed-cell foam delivers reliable flotation and gap filling for marine and dock applications. - • **Temperature-Optimized Performance:** Ideal working temperature of 75-80°F ensures maximum expansion and consistent results every time. - • **Versatile Insulation & Soundproofing:** Seamlessly insulates and soundproofs while resisting water absorption with 95-98% closed cells. ## Overview This 2lb density expanding polyurethane foam kit delivers 5 cubic feet of closed-cell buoyant foam designed for non-structural filling, soundproofing, and insulation. With a quick 45-second working time and full expansion in 5 minutes, it’s engineered for marine and dock flotation applications, meeting US Coast Guard safety standards and resisting water absorption for long-lasting performance. ## Description The Flotation Foam is soundproof, insulation, or provides extra buoyancy when mixed into equal parts and poured into place. 0.9 kg Density. Buoyancy range 45-54 kg./qt. and 217-272 kg./gal. For non-structural applications, 0.9 kg of foam is recommended for empty filling. It can be poured under the decks and inside the gaps where a light buoyancy foam is required to provide buoyancy. This foam has been tested according to US Coast Safety Regulation # 33 CFR 183.114. This foam contains approximately 95-98% closed cells that are resistant to absorbing water. ## Features - Flotation Foam is a polyurethane 2-piece foam, when mixed and pour in equal parts, this foam soundproof, insulates or provides extra lift. - This expandable foam is recommended for empty filling in non-structural applications. It can be poured under the decks and into the gaps where a light float foam is required to provide buoyancy. - 2# Density polyurethane buoyancy foam 1 Gallon Kit consists of 1/2 gallon Part A and 1/2 gallon Section B and produces 5 cubic feet. - Once fully cured, this foam can be coated with any polyester, epoxy or vinyl ester resin, without melting. - All expansion rates and times given are critical to temperature. Temperatures below 55°F reduce the expansion rate so more foam is required. The ideal operating temperature is 75° to 80°F or higher. The correct measurement of these products is very important. Working time before foaming: About 45 seconds Time before full expansion: about 5 minutes ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08RP8DNDB | | ASIN | B08RP8DNDB | | Brand Name | Fiberglass Supply Depot | | Coverage | 5 cubic feet | | Customer Reviews | 4.6 4.6 out of 5 stars (285) | | Customer reviews | 4.6 4.6 out of 5 stars (285) | | Date First Available | 30 May 2025 | | Item model number | Poly2lbgk | | Manufacturer | Fiberglass Supply Depot Inc. | | Manufacturer | Fiberglass Supply Depot Inc. | | Manufacturer Part Number | Poly2lbgk | | Material Type | Resin | | Model Number | Poly2lbgk | | Number of Items | 2 | | Number of Packs | 1 | | Package Dimensions | 26.19 x 23.9 x 16.79 cm; 4.85 kg | | Recommended Uses For Product | Soundproofing, Thermal Insulation, Flotation, Void Filling | | UPC | 819794022859 | ## Product Details - **Brand:** Fiberglass Supply Depot - **Manufacturer:** Fiberglass Supply Depot Inc. - **Material:** Resin - **Number of Packs:** 1 - **Recommended uses for product:** Soundproofing, Thermal Insulation, Flotation, Void Filling ## Images ![2lb Density Expanding Cast Foam, 2-Piece Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Sound Insulation, Filling Gaps and Insulation (1 Gallon Kit) - Image 1](https://m.media-amazon.com/images/I/61ldT-7o9dL.jpg) ## Questions & Answers **Q: Can the Part B liquid be colored so that the expanded foam will be a color other than beige?** A: unknown It can be painted. **Q: can this be cut with hot wire ?** A: Yes, but it is high density. It will not cut as easily as Styrofoam **Q: Does this require moisture to cure?** A: This will not cure with moisture present. **Q: whats the difference between 2#,4# & 6#? is the polyurethane hydrophobic or hydrophilic?** A: To clarify, each density of foam has a different expansion rate, so they are all used for different applications. Please refer to the reference chart of each listing for details regarding expansion. This material is hydrophobic. -FSD ## Frequently Bought Together - 2 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 - TCP Global Wood Paint Mixing Sticks - 50 Pack - Automotive, Crafts, Airbrush, Art --- ## 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.at/products/733261437-2lb-density-expanding-cast-foam-2-piece-polyurethane-closed-cell](https://www.desertcart.at/products/733261437-2lb-density-expanding-cast-foam-2-piece-polyurethane-closed-cell) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-11-04*