Yes, we've Por-15'd before. Surprisingly the frame was the only part of the truck that was not rusted too bad. Had one heck of a time getting off the remaining undercoating. After much scrapping we are wire brushing, by hand and drill, using POR 15 degreaser (just in case we missed anything) and their metal prep before the por-15 and then will be topcoating with (if I remember correctly) the chassis black (it could be the hardcoat topcoat) I thought about sandblasting but thought that might make it too clean. Thanks for the additional advice.
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