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 your adventure with speed and strength!

HIGH VISCOSITY POWER - Thick, premium formula ensures superior adhesion even in challenging marine environments.
COMPACT READY TO USE - 10 fl.oz tube designed for easy handling and precise application every time.
FAST TRACK MARINE BONDING - Cures fully in just 48 hours—get back on the water faster.
UNMATCHED WATERPROOF STRENGTH - Reliable permanent seal above and below the waterline for ultimate durability.
PROFESSIONAL GRADE RELIABILITY - Trusted 3M quality engineered for long-lasting performance in harsh conditions.

3M Marine Adhesive/Sealant Fast Cure (White, 10 fl.oz) is a high-viscosity, waterproof sealant designed for permanent bonding above and below the waterline. It becomes tack-free within 1-2 hours and fully cures in 48 hours, delivering professional-grade durability and fast turnaround for marine repairs and projects.

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Brand	3M
Item Form	Liquid
Colour	White
Item Package Quantity	1
Package Information	Pail
Item Volume	10 Fluid Ounces
Viscosity	High
Full Cure Time	48 Hours
Water Resistance Level	Waterproof
Net Quantity	1.00 Count
Viscosity Level	High
UPC	051135065204
Number of Pieces	1
Global Trade Identification Number	00051135065204
Manufacturer	3M
Model number	5200FC
Number of Memory Sticks	1
Item Weight	395 g
Product Dimensions	33.02 x 5.08 x 5.08 cm; 394.63 g
Item model number	5200FC
Item Height	2 Inches
Item Width	2 Inches
Included Components	295ml
Are batteries included?	No

3M Marine Adhesive/Sealant Fast Cure (White, 10 fl.oz)

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