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Don't use primer only engine paint. That's the problem. Wet sand it with water, start with courser paper and finish with 320 grit.

You don't need primer, it's not hi temp rated. I have painted at least 30 motors and never used primer, the motor get's too hot for primer.



it looks that way. it's amazing how well the primer stuck to the metal, and how poorly the paint stuck to the primer.

time to strip it again and get it to bare metal...