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

3M 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 in 1-2 hrs

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Details

Brand
3M
Item Form
Liquid
Material
Plastic

Description

⚓ Seal your marine legacy with 3M’s fast, flexible, forever-strong bond!

RAPID FAST CURE FORMULA - Tack-free in just 1-2 hours, fully cured in 48 hours—get back on the water faster.
SHOCK VIBRATION ABSORBER - Elastomeric flexibility absorbs swelling, shrinking, and shocks to maintain seal integrity.
SALTWATER WEATHER WARRIOR - Engineered to resist salt spray, UV, and harsh marine conditions without losing strength.
VERSATILE MULTI SURFACE USE - Ideal for deck fittings, hull seams, portholes, and more—your all-in-one marine adhesive.
PERMANENT MARINE GRADE BONDING - Creates tough, flexible seals on wood, fiberglass & metal for lasting durability.

3M Marine Adhesive Sealant 5200FC is a high-strength, fast-curing polyurethane sealant designed for permanent, flexible bonds on multiple marine surfaces. It resists saltwater, weathering, and vibration, curing tack-free in 1-2 hours and fully in 48 hours, making it ideal for above and below waterline applications. Trusted by professionals for durable, watertight seals on wood, fiberglass, metal, and more.

Specifications

ASIN	B000XBFCUO
Best Sellers Rank	#2,839 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #13 in Industrial Joint Sealants
Brand	3M
Brand Name	3M
Color	White
Compatible Material	Ceramic
Container Type	Cartridge
Customer Reviews	4.6 out of 5 stars 8,862 Reviews
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	0.87 Pounds
Manufacturer	3M
Material	Plastic
Material Type	Plastic
Model	5200FC
Number of Pieces	1
Other Special Features of the Product	Strong,Waterproof
Part Number	00051135065204
Special Feature	Strong,Waterproof
Specific Uses For Product	Fleet and plant maintenance.
Tensile Strength	600 Pounds Per Square Inch
UPC	051135065204
Unit Count	10.0 Fluid Ounces
Viscosity Level	High
Volume	10 Fluid Ounces
Water Resistance Level	Water Resistant

Reviews

N**N

16.04.2024

J**M

13.01.2024

A**R

19.03.2026

J**S

21.06.2024

C**Y

11.04.2023

M**C

4.04.2026

G**Y

31.10.2025

B**G

1.05.2026

A**D

9.02.2023

L**T

16.10.2025

B**Y

14.06.2024

D**I

16.02.2026

A**R

25.01.2026

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