3M Marine Adhesive Sealant 5200 Fast Cure is a one-component, high-strength, moisture-curing, gap-filling polyurethane for permanent bonding of aluminum, wood, gelcoat and fiberglass. This fast cure version of 5200 is formulated to typically cure within 48 hours. It chemically reacts with moisture to provide strong, flexible bonds above or below the waterline. The seal is extremely strong, retains its strength above or below the water line. Stays flexible too and allows for structural movement so stress caused by shock, vibration, swelling or shrinking is effectively absorbed. Has excellent resistance to weathering and salt water. Check the bonding and sealing jobs this product can handle for you: fiberglass deck to fiberglass hull, wood to fiberglass, porthole frames and deck fittings, under mouldings, hull seams above and below water line. Stern joints. Deck housing, etc.