Pat, I just put this stuff on the bottom of my 40 (over PPG Delfleet, which is tough stuff by itself). It's a 2 component clear protective coat. I have not used it before but it seemed to be just what I wanted; keeps everything body color, allows you to see any potential rust bubbles before they get out of control, and resists chips and abrasion. I may do the inside of the tub with it too. I just couldn't bring myself to cover everything with bedliner, I've seen too many cases of it peeling off or breeding rust underneath.
You could put as many coats on as you wanted I would think, not sure if you could play around around with it to get texure as I think its supposed to be smooth. I like smooth; easier to clean.
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