TotalBoat 52 Million is a fast-cure marine adhesive sealant, with a professional-grade polyurethane formula for the toughest jobs on boats and RVs. Creates strong, flexible, permanent bonds above and below the waterline. Use 52 Million on just about every surface; fiberglass, gelcoat, wood, metal, glass, and even some plastics. Ideal for load-bearing applications, it creates durable seals that won't shrink, crack, or break loose under harsh marine conditions. Perfect for hull-to-deck joints, thru-hulls, keels, strakes, and other critical, high-stress areas. This marine sealant cures quickly; it's tack-free in just 10-30 minutes, forms a watertight bond in 24 hours, and reaches full cure in 3-5 days. The fast-cure formula means repairs take less time, and get you back out on the water sooner. 52 Million is unaffected by saltwater, continuous sunlight exposure, vibration, moisture, or temperature changes. The 10 oz cartridge fits all standard caulking guns, and is easy to apply. Once fully cured, this ultra dependable, weather-resistant sealant lasts for years in tough conditions. Compare to 3M 5200 Marine Sealant, Sikfaflex, Loctite, Berkland, and Fortivo.