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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🌊 Seal the deal fast, flex with confidence!

FLEX THAT LASTS - Polyurethane formula resists cracking and peeling, even under vibration and shock.
WATERLINE WARRIOR - Seals flawlessly above and below water, perfect for marine joints and hardware.
RAPID 24 HOUR CURE - Get back on the water faster with a one-part formula that cures in just one day.
SEMI PERMANENT STRENGTH - Strong yet allows disassembly without damage—ideal for maintenance and upgrades.
SALTWATER PROOF DURABILITY - Engineered to withstand harsh weather and saltwater environments for long-lasting performance.

3M Marine Adhesive Sealant Fast Cure 4200 is a professional-grade, one-part polyurethane sealant designed for marine and RV applications. It cures quickly in 24 hours, forms flexible, watertight bonds above and below the waterline, and resists weathering, saltwater, vibration, and shock. Its medium-strength, semi-permanent formula allows for easy disassembly, making it the go-to sealant for durable, maintenance-friendly marine repairs.