Will this work to fasten galvanized sheet metal to a aluminum boat ?

Depends on the load. If you remove the patina (sand or wire brush until they look shiny) from both surfaces and there is sufficient bonding area it should.Make certain the joint is secured until the adhesive is fully cured.

Will this work on a 2 inch pvc pipe coupling that is under water

If the coupling is underwater and can't be moved out of the water, or the water drained, then this would be the best chance for a repair of anything I know. I would clean and steel wool the surface before putting this on. I'm just guessing at what the situation is and if this would be a solution. But I'm really impressed with 3m 05220. It was made to stick stuff like speed sensors on the fiberglass hulls of boats while they are still in the water.

does this work on polyethylene (Kayaks)

Yes Once setup you can't remove

Can the adhesive be sanded

Once fully cured it can be sanded. It will fill the sand paper a bit. As with any adhesive, the quality of the surface prep will determine how well the product sticks to the surfaces and thus how finely you can feather the product.

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🛠️ Seal the deal with marine-grade strength and speed!

RAPID TACK FREE TIME - Get to work faster with a tack-free surface in just 48 hours—no waiting around.
COMPACT READY TO USE - Convenient 10 fl.oz cartridge fits easily in your toolkit for quick application anytime.
DURABLE WEATHERPROOF SEAL - Engineered to resist harsh weather and corrosive saltwater, ensuring long-lasting protection.
UNMATCHED MARINE STRENGTH - Seals and bonds that hold strong above and below the waterline, perfect for any marine project.
PROFESSIONAL GRADE POLYURETHANE - Premium material designed for maximum adhesion and flexibility in demanding environments.

3M Marine Adhesive/Sealant Fast Cure is a high-performance polyurethane sealant that becomes tack-free in 48 hours and fully cures in 5-7 days. Designed for marine environments, it provides a strong, durable seal that withstands weathering and saltwater exposure both above and below the waterline. Packaged in a 10 fl.oz cartridge, this white sealant is ideal for professionals seeking reliable, fast-curing adhesive solutions.

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Manufacturer	3M
Part number	00051135065204
Item Weight	395 g
Product Dimensions	33.02 x 5.08 x 5.08 cm; 394.63 g
Item model number	5200FC
Size	10 fl.oz cartridge
Colour	White
Material	Polyurethane
Item Package Quantity	1
Number of Pieces	1
Special Features	Strong
Specific uses	Marine
Included components	CAULKS / SEALANTS / EPOXIES
Batteries included?	No
Batteries Required?	No

3M Marine Adhesive/Sealant Fast Cure (White, 1/10 Gallon)

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