You can't paint over questionable, or unstable paint.
Brings to memory when I painted my Harley a long time back with Imron urathane. It actually looked real good for a few years. Then one day at the carwash I hit it with the pressure washer and the top coat blew off the tank in a large sheet leaving the primer exposed.

It was either the wrong primer, or inadequate prep. I don't think I sanded the primer properly before the top coat. And I had rattle canned the primer coat.

That doesn't mean I wouldn't try again, but I will be more careful and follow the advice of the pros on this site.

Good luck with your project -