{"product_id":"4-lb-density-expanding-pour-foam-quart-kit-closed-cell-flotation","title":"4 Lb Density Expanding Pour Foam Quart Kit - Closed Cell Flotation","description":"\u003cp\u003eOur review of the 4 Lb. Density Expanding Pour Foam Quart Kit finds it best for makers, boat owners, and hobbyists who need a reliable closed cell pourable foam for flotation, filling voids, or insulation. The single biggest reason to buy is its balance of density and workability: at 4 lb density the cured foam becomes firm and buoyant while remaining compatible with polyester, epoxy, or vinyl ester laminates, so it can be used inside hulls or for sculpting without risk of melting under resins.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-part formulation:\u003c\/strong\u003e Mixed in equal parts, Part A and Part B create a consistent pour foam suitable for controlled in-place casting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 lb closed cell density:\u003c\/strong\u003e Provides strong buoyancy and a firmer cured core that is useful for floatation and decoy or taxidermy applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduces 1\/2 cubic foot:\u003c\/strong\u003e The quart kit yields a predictable volume from one pint of each component, helping plan fills and avoid waste.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible with laminates:\u003c\/strong\u003e Once fully cured the foam can be laminated with polyester, epoxy or vinyl ester resins without melting, enabling composite repairs and encapsulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast reaction times:\u003c\/strong\u003e Working time is short (about 45 seconds) with full expansion around 5 minutes, so jobs finish quickly when mixed at the ideal temperature.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe kit is aimed at boat and dock owners seeking extra buoyancy, DIYers making floating decoys, and modelers needing a stable carveable core; its closed cell nature and resin compatibility make it practical for marine repairs and small sculpting tasks. The predictable yield and firmer cured surface suit projects where rigidity and displacement matter more than extreme expansion.\u003c\/p\u003e\u003cp\u003eThose who prefer long working times or larger volume pours should look elsewhere; the product demands accurate equal-part measuring and benefits from ambient temperatures near 75 to 80 F for proper expansion, so it's not ideal for very cold workshops or large industrial pours without temperature control.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHigh density closed cell foam yields firm, buoyant results suitable for boat flotation.\u003c\/li\u003e\n\u003cli\u003eCan be laminated over with polyester, epoxy or vinyl ester resins once cured, enabling composite work.\u003c\/li\u003e\n\u003cli\u003eProduces a known volume (approx 1\/2 cubic foot) from the quart kit, aiding planning.\u003c\/li\u003e\n\u003cli\u003eFast cure and expansion deliver quick turnaround on small projects.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eShort working time (around 45 seconds) requires quick, accurate measuring and mixing.\u003c\/li\u003e\n\u003cli\u003eExpansion and yield are temperature sensitive; performance drops below about 75 F.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003e2-part polyurethane pour foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDensity\u003c\/td\u003e\n\u003ctd\u003e4 lb (closed cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit size\u003c\/td\u003e\n\u003ctd\u003eQuart kit (1 pint Part A + 1 pint Part B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduced volume\u003c\/td\u003e\n\u003ctd\u003eApproximately 1\/2 cubic foot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking time\u003c\/td\u003e\n\u003ctd\u003eAbout 45 seconds before foaming\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull expansion time\u003c\/td\u003e\n\u003ctd\u003eAbout 5 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIdeal temperature\u003c\/td\u003e\n\u003ctd\u003e75 to 80 F or above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThis quart kit is a practical, cost-effective solution for small to medium flotation, filling, and sculpting tasks where a firm closed cell core and resin compatibility matter. It is good value for hobbyists and boat repairers who can work quickly and control temperature, but those needing long pot life or large volume pours should consider larger or slower-reacting systems.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eHow much volume does one kit produce?\u003c\/strong\u003e\u003cbr\u003eOne quart kit (one pint each of Part A and Part B) produces roughly 1\/2 cubic foot of cured foam.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the cured foam be laminated over?\u003c\/strong\u003e\u003cbr\u003eYes, once fully cured it can be laminated with polyester, epoxy or vinyl ester resins without melting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature works best for mixing?\u003c\/strong\u003e\u003cbr\u003eExpansion rates are temperature sensitive; ideal working temperature is about 75 to 80 F or above for proper expansion.\u003c\/p\u003e","brand":"Fiberglass Supply Depot","offers":[{"title":"Default Title","offer_id":48263808712923,"sku":"B08T255GS5","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81XhbU5HAlL._SL1500.jpg?v=1778332011","url":"https:\/\/gearmusthave.com\/products\/4-lb-density-expanding-pour-foam-quart-kit-closed-cell-flotation","provider":"GearMustHave","version":"1.0","type":"link"}