A couple of years ago I copied someone in this forum (apologies on not remembering) who turned their ski locker into a cooler. I took the carpet out of mine, went to town with a die-grinder, drilled a couple of holes for drain fittings, bondo'd the low areas and then used 2-part garage floor epoxy to give it a rugged grey coating. This first time I ended up laying it up WAAAY too thick (made the mistake of using all the garage epoxy in 1 setting) and it ended up cracking super bad.
I gave it a few weeks to cure, then filled the cracks with bondo, resanded and then re-epoxied in about 6 layers of the same material.
This winter it cracked again. Portions of the epoxy are starting to flake off and the whole surface is pretty unsmooth. I probably need to start grinding again and put another layer over the top.
My question is about material -- does anyone know of a finish that will stay flexible enough to take a case of beer being dumped into it without cracking but still stay watertight? I also need it to look nice and be durable (the garage epoxy was attractive because it was colored.)