Seeing this was locked in error & bugs before the answer could be given:
Any partially used can of max2k or UPOL should be turned upside down to clear tip, then stored in a fridge. It wont last for ever but it will last approx 3-4 weeks if kept cold.
Usually a can of Max2k will last about 48-72 hrs.
One great thing I use left over can for is fixing headlights with that brown burned plastic....you know that brown burnt crap that forms on plastic headlight covers on cars of age.
Heres what I do:
1) Get insect repellent with deet in it. (Sanding /polishing the lights coverswith those kits is bull) Spraying repellent with deet will chemically eat through the stuff in a jiffy. Spray it on plastic headlight cover and wipe off with clean towel brown haze, repeat if necessary, get it even and looking right.....This will make plastic cover like new.
2) to seal new clear plastic headlight cover, I tape off and spray with leftover can of max2K. This will seal plastic, bond to plastic, and fill the open pores of the plastic with clear coat.
3) charge guy you just did car $50.00-$100.00 and pay for new cans of UPOl or Max2K
You're welcome Swaylock freaks.