3M 4200 Polyurethane Fast Cure Adhesive-Sealant 10oz White3M Fast Cure Marine Sealant is a one-component, medium-strength, moisture-curing, gap-filling polyurethane that delivers strong flexible bonds to aluminum, wood, gelcoat, and fiberglass. It forms a watertight, weather-resistant seal above and below the waterline. It's flexibility allows for dissipation of stress caused by shock, vibration, swelling, or shrinking. This sealant is recommended for the following applications: fiberglass deck to hull, wood to fiberglass, portholes, deck fittings, rubrail attachment, sealing screwholes, and stanchion supports.Features: Medium strength marine bonding allows for disassembly; Formulated for fast cure, providing rapid results; Tack-free in 1 hour and typically cures in 24 hours; Above and below the water line applications; Flexible and durable adhesion withstand stress; Bonds to aluminum, wood, gelcoat and fiberglass; Color is white.; Caulking gun tube.; Click to Download 3M 4200 Marine Sealant Application Instructions