Most of the bedliner guys (Rhino, Line X, etc) have local dealers who do the work. I know the guy in CT will speay anything and Rhino guys th Texas regularly speay oil field gear sop anything is possible..

but to get complete coverage you would have to have the car on a lift, which most of the shops do not have.

also you would have to mask all the piping, wiring, etc as it would become encapsulated if not protected. and what about heat exposure from the cat converter?

The roll on stuff sold at Auto Parts stores is just basic thick epoxy paint.

Same with the garage floor paint.