Will this product go bad if it isn't all used within 24 hours after removing the seal?

Not if you reseal it (remove and clean the nipple and put a nail or bolt in the tube opening) stick it in a ziplock and put it in the refrigerator. Take it out before next use and let it come up to room temperature or it will be very thick and hard to dispense.

Can this sealant be used to fill in grout between tiles in the shower? Is it hot waterproof?

This a marine and Rv’s sealer for vehicles that requires movement only, not for shower.

Will this adhere a flap down on an (epmd) rubber pond liner? i don’t need it sealed i just want it to stay layer flat.

It does say in the specs that it remains flexible, so it should work. You might have to scuff up the surface a little to give it a little more 'tooth', but see if 3M has anymore information on their site for this product. Have you considered using an adhesive specifically made for epdm? EPDM is used on roofs, so an adhesive should be easily found.

Can you get this clear?

Any color you want, as long as it's white

3m Marine Adhesive Sealant 4200 Fc

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 58.44

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Seal it fast, seal it strong — stay afloat with 3M Marine!

RAPID 24 HOUR CURE - Get back on the water faster with a one-part formula that cures in just 24 hours—no mixing required.
DURABLE FLEXIBILITY - Retains strong, crack-free bonds even under vibration, structural movement, and shock—perfect for dynamic marine environments.
SEMI PERMANENT STRENGTH - Medium-strength adhesive allows for secure bonding with the option to disassemble parts without damage after prolonged use.
MARINE GRADE WATERPROOF SEAL - Engineered to withstand harsh saltwater and weather conditions, sealing joints above and below the waterline flawlessly.
VERSATILE MULTI SURFACE ADHESION - Bonds wood, fiberglass, gelcoat, plastics, and metals—ideal for rub-rails, portholes, deck fittings, and more.

3M Marine Adhesive Sealant Fast Cure 4200FC is a professional-grade, polyurethane-based sealant designed for marine applications. It cures rapidly within 24 hours, providing a flexible, waterproof, and weather-resistant bond that adheres to a variety of materials above and below the waterline. Its semi-permanent formula ensures durability under vibration and shock while allowing disassembly without damage, making it the go-to sealant for boat hardware, rub-rails, and structural joints.

Specifications

ASIN	B001QWN8VE
Best Sellers Rank	#2,340 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #20 in Adhesive Caulk #22 in Industrial Sealants #1,566 in Hardware
Brand	3M
Brand Name	3M
Color	White
Compatible Material	Wood
Container Type	Cartridge
Customer Reviews	4.6 out of 5 stars 1,696 Reviews
Full Cure Time	24 hours
Global Trade Identification Number	00051135065600
Included Components	One 10 Ounce Cartridge
Item Form	Liquid
Item Package Quantity	1
Item Type Name	3M Marine Adhesive Sealant Fast Cure 4200 (06560) – Semi-Permanent Flexible Adhesive Sealant for Boats and RVs – White - 10 fl oz (295 mil)
Item Weight	12.8 ounces
Manufacturer	3M
Material	Polyurethane , Wood
Material Type	Polyurethane,Wood
Model	3004.78
Number of Pieces	1
Other Special Features of the Product	Strong
Part Number	00051135065600
Special Feature	Strong
Specific Uses For Product	boating
Tensile Strength	300 psi
UPC	051135065600
Unit Count	10 Fl Oz
Viscosity Level	Medium
Volume	295 ml
Water Resistance Level	Waterproof

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