A related question: Can I use Polytone (Polyfiber color topcoat) to paint the aluminum parts? Is there any pre-coating recommended?
———- Rudi, Polytone colors can be used on metal, fiberglass etc. But it seems that PF has gotten away from recommending this procedure. They now seem to push using their enamel or urethane on the metal. The best prep for alum is: Acid etch the metal, clean and dry it after per instructions. Alodine treatment if priming will not be within 8hrs of etching. Prime with self etching primer usually called a wash primer. This “bites” into the alum for best bond and provides a better surface for epoxy primer to adhere to. Epoxy prime. If using PF epoxy primer, be careful not to spray on too thick as it will fisheye and pinhole. If metal is new and slick, one coat should do. If you have bodywork to sand out, 2 or 3 coats as required for sanding. Scuff sand epoxy primer with 400 grit paper wet. Do not cut thru primer or you will have to recoat. Paint. The minimum # of coats is 3. Always use the same # of coats on every part and if possible, the same spray gun. Many times you can find airpl
