i have used epoxy paint for my iguanna cage, got me higher than a kite, but it held up to the moisture and her nails.
I worked for a no name shop that had thier own spray in liner, it was and A & B compound that was mixed at the nozzle. Our spray booth was not heated but the compound when mixed generated a lot of heat while it was curing. That stuff would stick to anything.
We did have some people bring stuff back under waranty, but mostly the edge of the tailgate and it was always totally beat up......
I know from my personal inside experience, the spray in bed liners all come out diffrently due to the materials used, some came out softer than others, some came out hard, I have seen line-x, rino and some of the others and they all come out slighttly diffrent every time, depending on the hunidity, and just the way the nozzle works that day.