I'm guilty of trying that stuff on my van,to fill in some rot holes so bondo could be applied over it...in less than a year the area looked like a tumor ,ready to pop...it sucks up water like a sponge ,holds it there,and makes sheet metal turn into something resembling rusty flaky puff pastry...
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Metal is the only thing to put over holes--even if its only pop riveted or drive screwed in place,it'll last a lot longer than any quick fix like that foam crap,or steel wool,crumpled up aluminum foil,--I have even seen newspapers and fiberglass house insulation used to fill "cavaties" in rockers and rear quarters before..
..Metal is the only thing to put over holes--even if its only pop riveted or drive screwed in place,it'll last a lot longer than any quick fix like that foam crap,or steel wool,crumpled up aluminum foil,--I have even seen newspapers and fiberglass house insulation used to fill "cavaties" in rockers and rear quarters before..

