Quote:
Originally Posted by chiphead
I would remove loose rust and scale then treat with phosphoric acid. Sop up the excess and let dry. Then top coat with a primer product that is compatible with acid etch adhesion promoters. That usually means its compatible with phosphoric acid.
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Agree with the phosphoric acid...
Had an S10 and entire roof was heavily pitted with rust. Hit it with a grinder, soaked it down with phosphoric acid, after it dried, wiped it with a damp rag, let it dry and applied 2 coats of 2K primer. Drove it for 3 yrs in that state and it never popped.