painted my 1st gen bumpers using duplicolor bedliner.....
and the lower bodyline and bed and roll bars and interior floors....
i went crazy with the stuff
looks tits....fairly easy to clean (pressure washer)
not as gritty as herculiner
tough as nails
easy to fix if scratched or chipped
just PREP, PREP, PREP the surface
if its not sanded and cleaned it will peel off
i had a few issues at first until i got ALL of the old paint off