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

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Marine Adhesive Sealant Fast Cure 4200 (06560) – Semi-Permanent Flexible Adhesive Sealant for Boats and RVs, White, Flexible Bonds, Underwater-Safe, 295 mL Cartridge

Product ID: 9786662

Details

Brand
3M
Item Form
Liquid
Material
Polyurethane
Special Feature
Strong
Specific Uses For Product
boating

🌊Waterproof above & below waterline

⏱️Cures in 24 hours

🛠️Flexible, shock-resistant bonds

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Description

🌊 Seal it fast, seal it smart—stay afloat with confidence!

FLEXIBILITY THAT LASTS - Polyurethane formula resists cracking and peeling, adapting to vibration and movement.
FAST TRACK YOUR REPAIRS - One-part formula cures in just 24 hours—get back on the water without delay.
SEMI PERMANENT STRENGTH - Strong enough to hold, yet allows disassembly without damage—perfect for maintenance.
SEAL LIKE A PRO ABOVE BELOW - Creates watertight, weatherproof seals that thrive even underwater.
TRUSTED MARINE GRADE PERFORMANCE - Top-rated by professionals for durability in harsh marine environments.

3M Marine Adhesive Sealant Fast Cure 4200 is a professional-grade, semi-permanent polyurethane sealant designed for boats and RVs. It cures in 24 hours, bonds flexibly to wood, fiberglass, plastics, and metals, and provides waterproof seals above and below the waterline. Resistant to weathering, saltwater, vibration, and shock, it offers durable, watertight protection while allowing parts to be disassembled without damage.

Specifications

ASIN	B001QWN8VE
Best Sellers Rank	#1,219 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 in Industrial Sealants #9 in Adhesive Caulk #1,124 in Hardware
Brand Name	3M
Color	White
Compatible Material	Wood
Container Type	Cartridge
Customer Reviews	4.6 4.6 out of 5 stars (1,660)
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	0.8 Pounds
Manufacturer	3M
Material Type	Polyurethane,Wood
Model	3004.7819
Other Special Features of the Product	Strong
Part Number	00051135065600
Specific Uses For Product	boating
Tensile Strength	300 Pounds Per Square Inch
UPC	051135065600
Unit Count	10.0 Fluid Ounces
Viscosity Level	Medium
Volume	295 Milliliters
Water Resistance Level	Waterproof

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