42 Million Marine Adhesive Sealant

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.

Need permanent seals on joints and seams? TotalBoat 52 Million is your answer, with the same flexibility and UV-resistance.