Quote:
Originally Posted by 69chevy lwb
Good undercoating is fine but expect it to become dirt colored. I prefer por15 and I use 3m aerosol undercoating for the places you just can't reach like the insides of cab corners ect. It is possible for the undercoating to cause problems. I have a utility bed that was undercoated and the whole bottom is rusted away. When you peel the undercoating back it's full of dirt and rust. But who knows how it was prepped before hand
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Im all in on the por-15. Its non porous. Good stuff. Is what i used, and they make an aerosol now for those hard to reach areas like mentioned above.