How fine of sandpaper did you use? I've never seen anything like that and I've used it on a bunch of boats. I've use 180 grit with no problems and I think even 320. That should have been enough time for it harden unless it was really thick. If you used a whole gallon on just the floor it must have been pretty thick. I did a whole floor and cap with 2/3's a gallon. So with it being thick it probably needed a lot longer to cure. Also if its humid it can add some time to the cure. I've never seen any peel off.
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