I have heard that Por-15 is an excellent rust cure but looking at the web
site for this product (por-15.com) it looks like the product must be painted
on so thick that it would be completely unsuitable for exterior body work.
Any coat that was sanded down enough to blend in with undamaged body areas
would be unable to provide the "rust return" protection that was the reason
for applying Por-15 in the first place.
        True?