--- product_id: 16351694 title: "Expanding Liquid Foam 2 Gallon Kit, 4 Lb Density 2-Part Marine Foam" brand: "fgci" price: "$488.79" currency: USD in_stock: true category: "Fgci" url: https://www.desertcart.us/products/16351694-expanding-liquid-foam-2-gallon-kit-4-lb-density-2 store_origin: US region: United States of America --- # 2-part rapid expanding foam 4 lb density for marine-grade strength Made in USA, 60+ years expertise Expanding Liquid Foam 2 Gallon Kit, 4 Lb Density 2-Part Marine Foam **Brand:** fgci **Price:** $488.79 **Availability:** ✅ In Stock ## Summary > 🛠️ Seal the deal with foam that floats your boat and your projects! ## Quick Answers - **What is this?** Expanding Liquid Foam 2 Gallon Kit, 4 Lb Density 2-Part Marine Foam by fgci - **How much does it cost?** $488.79 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/16351694-expanding-liquid-foam-2-gallon-kit-4-lb-density-2) ## Best For - fgci enthusiasts ## Why This Product - Trusted fgci brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Optimized 4 Lb Density:** Perfect balance of structural integrity and buoyant flotation for marine and insulation needs. - • **Marine-Grade Versatility:** Engineered specifically for boat flotation, transom fills, pontoon foam, and general insulation applications. - • **Rapid Expansion & Rigid Cure:** Fills voids and hulls quickly, curing into a durable closed-cell foam that stands the test of time. - • **Precision-Mixed 2-Part Formula:** Pre-measured 1-gallon parts A & B ensure flawless, hassle-free mixing every time. - • **Trusted American Craftsmanship:** Proudly made in the USA by Fiberglass Coatings with over six decades of marine innovation. ## Overview FGCI Expanding Liquid Foam 2 Gallon Kit is a two-part polyurethane foam system designed for marine and structural applications. With a 4 lb density, it offers an ideal mix of strength and flotation, rapidly expanding to fill voids and curing into a rigid, closed-cell structure. The kit includes pre-measured parts for precise mixing and is proudly made in the USA by a company with over 60 years of marine expertise. ## Description "FGCI Polyurethane Expanding Liquid Foam 2 Gallon Kit in 4 Lb density is a two-part structural foam engineered for marine flotation, void fill, and insulation applications. Includes 1 gallon each parts A and B for accurate mixing.When mixed, the liquid foam expands rapidly to fill voids, hulls, and hollow cavities, then cures to a rigid, closed-cell structure. 4 Lb density provides a balance of structural strength and flotation suited to the intended application.Made in the USA by Fiberglass Coatings, LLC in Saint Petersburg, Florida, with over 60 years of marine and composite expertise." ## Features - 2 PART EXPANDING FOAM: Two-part polyurethane foam expands rapidly when mixed, filling voids, hulls, and hollow cavities with a rigid, closed-cell structure. - 4 Lb DENSITY: 4 Lb density balances structural strength and flotation, suiting marine flotation, void fill, and insulation applications appropriate to the rating. - COMPLETE 2 Gallon KIT: Includes 1 gallon each of part A and part B, giving you accurate, pre-measured quantities for reliable mix ratios straight out of the kit. - MARINE AND STRUCTURAL USE: Engineered for boat flotation, transom fill, pontoon foam, void packing, and general insulation where rigid closed-cell foam is required. - MADE IN THE USA: Manufactured by Fiberglass Coatings, LLC in Saint Petersburg, Florida, backed by over 60 years of marine and composite coatings expertise. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B007V2294U | | Best Sellers Rank | #127,642 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #167 in Urethane Adhesives | | Brand Name | FGCI | | Compatible Material | Foam | | Container Type | Handle Container | | Customer Reviews | 4.0 4.0 out of 5 stars (4) | | Included Components | Kit | | Item Form | Liquid | | Item Package Quantity | 1 | | Item Weight | 18 pounds | | Manufacturer | Fiberglass Coatings | | Material Type | Polyurethane | | Model | 135437 | | Number of Pieces | 2 | | Part Number | 135437 | | Specific Uses For Product | Marine | | Unit Count | 1 Count | | Volume | 2 gallons | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** FGCI - **Item Form:** Liquid - **Item Package Quantity:** 1 - **Material:** Polyurethane - **Specific Uses For Product:** Marine ## Images ![Expanding Liquid Foam 2 Gallon Kit, 4 Lb Density 2-Part Marine Foam - Image 1](https://m.media-amazon.com/images/I/41wXsiyHjbL.jpg) ![Expanding Liquid Foam 2 Gallon Kit, 4 Lb Density 2-Part Marine Foam - Image 2](https://m.media-amazon.com/images/I/71qxVDYTZ5L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: I need a closed cell foam to mold a motorcycle seat. Would this be the correct foam to use?** A: Hello Richard, this product is not recommended for molding motorcycle seats as it is firm. You will need to use memory foam. - Thank you, FGCI Customer Service **Q: what color is it when dry?** A: It drys to an off yellow|Amber color, this particular foam is extremely rigid as well. **Q: Making a form fitted seat cushion which of your products would suit me best. water and fire resistant, sand able, glue able. density? black. tks** A: This stuff i purchaced is by no means a cushion soft. If anything its like cement!! **Q: Can this be painted latex paint once cured?** A: Oh yes its HIGH DENCITY. (SP) ?? Very tuff stuff. Very dence. And can be formed ## Frequently Bought Together - Polyurethane Expanding Liquid Foam 2 Gallon KIT, 4 LB Density Polyurethane Foam, Includes 1 Gallon Part A & 1 Gallon Part B, 2 Part Polyurethane Marine Foam - Fiberglass Cloth,6oz 50sq Feet E-Glass Plain Weave Glass Fiber Cloth,12 Feet*50 Inches Woven Fabric for Boat RC Plane Auto Surfboard Tub Pool Repair - TotalBoat 5:1 Marine Epoxy Resin Kit for Bonding, Filleting, Coating, and Laminating - Use for Fiberglass, Wood, Carbon Fiber, Boat Building, Repairs, Woodworking (Gallon, Slow Hardener, Pumps) --- ## 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.us/products/16351694-expanding-liquid-foam-2-gallon-kit-4-lb-density-2](https://www.desertcart.us/products/16351694-expanding-liquid-foam-2-gallon-kit-4-lb-density-2) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-25*