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 it fast, seal it forever – marine-grade strength that won’t quit!

RAPID TACK FREE FORMULA - Get to work faster with a sealant that sets to the touch in just 1-2 hours, slashing downtime and boosting productivity.
FLEXIBLE YET STRONG SEAL - Enjoy a resilient polyurethane bond that flexes with movement without cracking or losing adhesion.
VERSATILE SURFACE COMPATIBILITY - Seamlessly bonds aluminum, wood, gelcoat, and fiberglass—perfect for all your marine repair and build needs.
PROFESSIONAL GRADE WATERPROOFING - Trust 3M’s industry-leading waterproof sealant to protect your vessels and structures from water damage, above and below the waterline.
UNMATCHED DURABILITY ABOVE BELOW WATERLINE - Create bonds that withstand the harshest marine environments, ensuring your projects last season after season.

3M Marine Adhesive/Sealant Fast Cure (10 fl.oz) is a high-viscosity, one-component polyurethane designed for permanent, waterproof bonding on aluminum, wood, gelcoat, and fiberglass. It cures fully within 48 hours, becoming tack-free in just 1-2 hours, making it ideal for fast, durable marine repairs above and below the waterline.

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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
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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