Ryan Weaver's 1969 Olds Cutlass S W31 Club Coupe

[Bernhard]

Originally Posted by Ryan1969Chevelle

I think so, I media blasted it, lightly, lightly, then washed it in solvent, then washed it in Acetone.... and expected no residue. (Looks like huge fish eye craters)

Second coat of paint looks much better... may sand or may start over, or maybe it will be ok as is. TBD.

Ryan W31

I have had good luck with wax and grease remover. Is your paint and media blast free of contaminants
Like with any Autobody shop chemical safety first. Correct solvent rated gloves, eye protection,ventilation, respirator and disposal of waste are all important.
We were taught to wash the car/parts first, then wax and grease remover. Only after cleaning was the car/parts ready to be sanded or media blasted.
After sanding or media blasting we would wax and grease remove the substrate again.
Oil from your bare hands after blasting/sanding can contaminate the substrate, that's why we would use clean gloves when handling parts that were in the white/bare metal.
Contaminate free painting is time consuming.
I have seen a shop go nuts trying to find the source of contaminants in their paint process. It was traced back to new techs over oiling their tools.