Hi Bond Foam Sealants/Flotation
Hi Bond Foam Sealants & Flotation: Pour-In-Place Marine Protection
When it comes to keeping a boat seaworthy and structurally sound, few products play as critical a role as a high-quality flotation foam. Hi Bond — the marine repair brand under the Evercoat family — has built a trusted reputation among boatbuilders, repair yards, and dedicated DIY boaters for delivering reliable, no-compromise solutions in this category. Their foam sealants and flotation products represent some of the most purpose-built urethane foam systems available for recreational and professional marine use.
Two-Part Closed Cell Urethane Foam — Built for the Marine Environment
Hi Bond's flagship offering in this category is its 2-Part Pour-In-Place Liquid Urethane Closed Cell Foam. This two-part liquid urethane closed cell foam is used in hulls and cavities for flotation or insulation. What sets closed cell foam apart from open cell alternatives is its ability to resist water absorption — a crucial trait in any marine application where moisture intrusion can compromise structural integrity over time.
The foam has a density of 2 lbs per cubic foot, uses liquid urethane as its base material, and follows a simple 1-to-1 mix ratio. This straightforward mixing system makes it approachable for boatyard professionals and hands-on owners alike. Once cured, the foam is not affected by gas or oil — a vital property given the fuel-rich environment below a boat's deck or within hull cavities.
Flexible Sizing for Any Job
One of the practical advantages of Hi Bond's pour foam lineup is the range of kit sizes available. Whether you're patching a small void or filling a large section of a hull, there's a kit scaled to the task. The 2-quart kit (containing one quart of Part A and one quart of Part B) delivers approximately 2.5 cubic feet of cured foam displacement. Larger 2-gallon kits — one gallon of Part A and one gallon of Part B — yield 5 cubic feet of cured foam displacement. A separate option makes 5 cubic feet once cured as well , while a 2-gallon container version delivers 10 cubic feet of cured foam displacement. This tiered approach means you only buy what the project requires, minimizing waste.
Why Flotation Foam Matters
Federal regulations for many recreational boats require built-in flotation to keep a swamped vessel afloat. Beyond compliance, properly installed closed cell foam adds meaningful structural rigidity to fiberglass hulls, helps dampen sound, and provides thermal insulation in enclosed compartments. Evercoat Hi-Bond is a trustworthy brand that specializes in repair solutions for the most frequent boat issues and has been a leader in manufacturing resins, thinners, thickening agents, and foam kits for boat care.
For boaters undertaking a hull restoration, repairing storm damage, or building a new vessel from scratch, Hi Bond's pour foam system integrates naturally into a broader fiberglass and epoxy repair workflow. Whether you need urethane foam or other materials, Hi Bond marine repair supplies comply with strict current regulations and are designed to be accessible for repairing small cracks or larger damages.
Working with Hi Bond Pour Foam
Proper technique matters with any two-part system. The components should be mixed thoroughly in equal parts before being poured into the target cavity, where the mixture will expand and cure in place. Ambient temperature affects expansion speed and final density — working in a moderate, stable environment yields the most predictable results. Once cured, the foam can be trimmed, sanded, or built upon with compatible marine resins and fiberglass fabrics. Explore the full Hi Bond brand lineup for complementary products, or browse all foam sealants and flotation solutions to compare options for your specific application.