What is "pretreatment solution"? I used brake cleaner (not the orange based stuff) to degrease my aluminum valley cover inside and out, then sandblasted with silica, then baked at 450 degrees for 15 minutes to outgas, then cooled and powder coated as normal. No problems. It has been on a running engine using synthetic oil for 3 years before being powder coated.
Hemi-T
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