Boat Repair Foam - Rigid, Closed Cell, Structural Foam - 2 Gal Kit - 8# Foam 8 pound per cubic foot density - very rigid foam Excellent base for polyester/fiberglass - readily accepts paints, stains and finishes Low viscosity, Rapid set time, Low to no odor, Good adhesion Expands to fill voids U.S. Coast Guard Approvable 33 CFR 183.114