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

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

Product ID: 47952269

Details

Brand
3M
Item form
Liquid
Material
Polyurethane
Special feature
Fast Drying
Specific uses for product
Marine

⚓600 PSI tensile strength

🌊Waterproof above/below waterline

⏱️Fast tack-free in 48 hrs

R90

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Description

⚓ Seal it like a pro—strong, fast, and built to last!

TRUSTED BY PROS - 3M’s marine-grade polyurethane sealant with 4.6-star rating and thousands of satisfied users.
FAST CURE FORMULA - Be tack-free in just 48 hours and fully cured within a week—get back to your projects faster.
FLEXIBLE DURABILITY - Maintains flexibility to accommodate structural movement without cracking or losing adhesion.
ALL WEATHER RESILIENCE - Superior resistance to saltwater and weathering keeps your seal intact season after season.
UNMATCHED MARINE STRENGTH - 600 PSI tensile strength ensures your repairs hold firm in the toughest conditions.

3M Marine Adhesive/Sealant Fast Cure is a high-performance polyurethane sealant designed for marine applications. It offers 600 PSI tensile strength, cures to a flexible, waterproof bond above and below the waterline, and resists harsh weather and saltwater. Fast tack-free in 48 hours and fully cured in 5-7 days, it’s the go-to choice for professionals demanding durable, reliable seals.

Specifications

ASIN	B000XBFCUO
Best Sellers Rank	274,886 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,857 in Sealers
Brand	3M
Colour	White
Compatible Material	Polyurethane
Container Type	Pail
Customer Reviews	4.6 4.6 out of 5 stars (4,343)
Full Cure Time	48 Hours
Global Trade Identification Number	00051135065204
Included Components	CAULKS / SEALANTS / EPOXIES
Item Form	Liquid
Item Package Quantity	1
Item Type Name	3M PELTOR BRAND--MARINE White Above or below waterline
Item Volume	10 Fluid Ounces
Item Weight	395 g
Manufacturer	3M
Manufacturer Part Number	00051135065204
Material	Polyurethane
Model Number	5200FC
Number of Pieces	1
Other Special Features of the Product	Fast Drying
Specific Uses For Product	Marine Applications
Tensile Strength	600 Pounds Per Square Inch
UPC	051135065204
Unit Count	295.0 millilitre
Viscosity Level	High
Water Resistance Level	Waterproof

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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R90

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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