Re: Prepping for painting a motor

[LLOYD LAUTNER]

I don’t recommend using Naptha or any petroleum based product for degreasing or prep for primer. Just smears the grease around and creates numerous problems. Recommend cleaning with water soluble degreaser like Simple Green, Super Clean, Castrol degreaser, etc. Then clean and etch with Phosphoric acid and quick water rinse and quick dry.

Zinc Chromate primers are very hard to find, and very finicky about adhesion, film thickness, and compatability of topcoats. Self etching epoxy primer (like Dupont Variprime) or PPG/Ditzler DPE primer is much more reliable. SEM is also good and comes in an aerosol can, so it is easy to use.