3M Marine Adhesive Sealant 5200 is a tough, flexible polyurethane for permanent bonding and sealing on your boat or watercraft. It is ideal for use on wood, gelcoat, fiberglass, metal and more. It is recommended for interiors, below the waterline and any other areas that are shielded from sunlight. This one-component adhesive sealant applies right from the container no metering or mixing is required. It reaches handling strength in 48 hours, and fully cures in 5-7 days to form a firm, flexible, waterproof seal on joints and boat hardware. Far more than a marine caulk, tough, flexible Marine Adhesive 5200 dissipates stress caused by vibration and shock and wont crack under dynamic force. It resists saltwater, wind, weather and temperature extremes for long periods of worry-free enjoyment on the water. In fact, for more than 50 years, 3M Marine Adhesive Sealant 5200 has been used and trusted as a marine sealant by professionals in some of the most demanding conditions on earth.