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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Marine Adhesive Sealant 5200FC Fast Cure, White, Flexible Bonds, Water-Resistant, 10 fl oz (295 mL) Cartridge with Nozzle, 1 Each

Product ID: 2635804

Details

Brand
3M
Item Form
Liquid
Material
Plastic
Special Feature
Strong
Specific Uses For Product
Fleet and

⚓600 psi tensile strength

🌊Water-resistant above & below waterline

⏱️Fast tack-free cure in 1-2 hrs

259.26 DT

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Description

⚓ Seal the deal fast, stay flexible forever!

RAPID READY TO USE - Fast curing formula forms a tack-free skin in just 1-2 hours, so your projects move faster without compromising durability.
ALL WEATHER WARRIOR - Superior resistance to saltwater, weathering, and vibration ensures your seals stay intact above and below the waterline.
MULTI SURFACE MASTERY - Bonds wood, fiberglass, metal, and plastics seamlessly—perfect for deck housings, hull fittings, and porthole mounting.
UNMATCHED MARINE STRENGTH - 600 psi tensile strength for permanent, reliable bonds that withstand the toughest marine conditions.
FLEXIBLE SHOCK ABSORBING - Elastomeric bonds absorb swelling, shrinking, and shock—keeping your marine fixtures secure and stress-free.

3M Marine Adhesive Sealant 5200FC is a high-strength, fast-curing polyurethane sealant designed for permanent, flexible bonds in demanding marine environments. It cures tack-free in 1-2 hours and fully in 48 hours, offering exceptional resistance to saltwater, weathering, and mechanical stress. Ideal for bonding wood, fiberglass, metal, and plastics above and below the waterline, it ensures durable, watertight seals that absorb vibration, swelling, and shock.

Specifications

ASIN	B000XBFCUO
Best Sellers Rank	#1,867 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #16 in Industrial Joint Sealants
Brand Name	3M
Color	White
Compatible Material	Ceramic
Container Type	Cartridge
Customer Reviews	4.6 4.6 out of 5 stars (8,998)
Full Cure Time	48 hours
Global Trade Identification Number	00051135065204
Included Components	3m marine sealant
Item Form	Liquid
Item Package Quantity	1
Item Type Name	3M 06520 Marine Adhesive/Sealant 5200 Fast Cure, 1/10 Gallon / White
Item Weight	13.92 ounces
Manufacturer	3M
Material Type	Plastic
Model	5200FC
Number of Pieces	1
Other Special Features of the Product	Strong,Waterproof
Part Number	00051135065204
Specific Uses For Product	Fleet and plant maintenance.
Tensile Strength	600 psi
UPC	051135065204
Unit Count	10 Fluid Ounces
Viscosity Level	High
Volume	10 fluid ounces
Water Resistance Level	Water Resistant

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TrustScore 4.5 | 7,300+ reviews

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Great experience from order to delivery. Highly recommended!

1 week ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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259.26 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

View all Trustpilot reviews