Paint Peeling Challenge

[Bob H]

If you use Scotchbrite, be sure to solvent wipe with acetone before applying primer as it can leave residual particulates.
From pic, primer did not adhere at all which indicates poor surface prep procedure. Solvent wipe, abrade surface, solvent wipe again and prime.

[martymayes]

If mechanically etching the surface, no need for self-etching primer. It's a waste of money. If chemically etching the surface, follow the instructions. Probably will say to skip mechanical etching.