TotalBoat 42 Million is a marine sealant adhesive with a fast-curing polyurethane formula that provides strong, flexible, semi-permanent bonds. Ideal for medium-strength applications above and below the waterline, 42 Million is perfect for sealing portholes, deck hardware, rub rails, stanchions and screw holes. This professional-grade sealant cures within 24 hours, to create a flexible seal that stands up to life at sea. Whether you're outfitting a new build or repairing a seasoned vessel, 42 Million sealant gives you lasting bonds while making future maintenance easier.
 
STRONG YET REMOVABLE BONDS FOR FLEXIBLE MARINE REPAIRS
TotalBoat 42 Million is a fast-curing polyurethane sealant designed specifically for DIY marine repairs and applications. Engineered for strong yet removable bonds, it’s the perfect choice for boat components above or below the waterline that might need future removal or repair. Creates flexible, long-lasting bonds on fiberglass, gelcoat, glass, metals, wood, some plastics, and even on dissimilar substrates. Use on deck fittings, hardware, hatches, portholes, railings, thru-hull fittings, and other parts where you may need to disassemble or replace down the road.
 
DURABLE FORMULA WITH MAXIMUM UV-RESISTANCE
Offering professional-grade flexibility, this durable adhesive withstands hull flexing, vibrations, saltwater exposure, and harsh weather without losing adhesion or cracking. Even under constant sunlight exposure, the polyurethane formula maintains its bond and won’t degrade over time. Use topside or down below for reliable, waterproof seals.
 
CREATES WATERTIGHT BONDS IN 24 HOURS
With a fast 24-hour fast cure, TotalBoat 42 Million adhesive helps you complete your boat projects quickly for reliable seals that last. Tack-free in 30-50 minutes to minimize downtime, this formula cures from moisture to achieve usable bonds within 24 hours. Full-strength cure reached in 3-5 days. Easy to apply right out of the 10 oz. cartridge using a standard caulking gun, it’s the ideal solution for DIY boaters and professional marine technicians alike. 
 
42 MILLION MARINE ADHESIVE SEALANT DETAILS
Creates flexible, semi-permanent seals 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 30–50 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
Strong enough for long-term use, yet easily removable for parts needing future maintenance or replacement
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.