TotalBoat 52 Million is a fast-curing, high-strength marine adhesive sealant with a polyurethane formula designed for permanent structural bonds. Ideal for demanding applications above and below the waterline, use 52 Million on hull-to-deck joints, thru-hull fittings, keel attachments, bulkheads, and other structural applications. Creates a watertight seal in just 24 hours, able to withstand saltwater, vibration, temperature extremes, and harsh marine conditions. Whether you're building, upgrading, or repairing your boat, 52 Million Marine Sealant is easy to apply and made to last the life of your vessel.
 
PERMANENT, HIGH-STRENGTH BONDS FOR STRUCTURAL MARINE REPAIRS
TotalBoat 52 Million is a fast-curing polyurethane adhesive sealant engineered for permanent structural bonding in marine applications. Ideal for critical installations above or below the waterline, this high-strength formula creates lasting bonds on fiberglass, gelcoat, metal, wood, glass, and compatible plastics. Ideal for use in hull-to-deck joints, thru-hull fittings, keel attachments, bulkheads, stringers, and other load-bearing marine components that demand maximum bond strength and durability.
 
HIGHLY DURABLE, UV-RESISTANT FORMULA
Designed to handle extreme marine conditions, TotalBoat 52 Million maintains exceptional adhesion and flexibility, resisting cracking, shrinking, or degradation from constant exposure to saltwater, UV rays, moisture, vibrations, and temperature fluctuations. Whether used topside or below the waterline, this sealant ensures professional-grade durability and reliable waterproof performance season after season.
 
FAST, WATERPROOF CURE IN JUST 24 HOURS
With a quick 24-hour full cure, TotalBoat 52 Million helps you complete structural marine repairs efficiently with strong, watertight seals you can rely on. Tack-free in 10-30 minutes to keep your workflow clean and efficient, the moisture-curing polyurethane formula achieves usable bond strength within one day, reaching maximum strength in 3-5 days. Simple application from the convenient 10 oz. cartridge makes it perfect for DIY boat owners and professional marine technicians alike.
 
52 MILLION MARINE ADHESIVE SEALANT DETAILS:
Creates permanent, structural bonds above and below the waterline
Bonds well to fiberglass, gelcoat, metals, some plastics, glass, and wood
Flexible formula maintains adhesion through vibrations, shocks, hull movement, and temperature extremes
Tack-free in just 10–30 minutes for clean and easy application
Fully waterproof and ready for use within 24 hours
Won’t sag or run, ideal for precise applications on vertical or overhead surfaces
Exceptional resistance to saltwater, UV rays, moisture, and harsh marine conditions
10 Oz. cartridge fits standard caulking guns for simple application
Disposable gloves included for safer use
Use what you need now, then store the remainder conveniently for future projects.