3M Polyurethane Adhesive Sealant: 5200, White, 640 oz Container Size, Drum

These marine-grade polyurethane caulks and sealants form a strong, flexible, waterproof bond in applications that are exposed to salt water and weathering. They withstand vibration, swelling and shrinking and are intended for use on materials such as fiberglass, wood, and gelcoat in the building and repair of boats and marine equipment.