This painting ain't quite as easy as everyone thinks...huh?

Any time you sand through a catalyzed topcoat clear, painting over it becomes "hazardous".

The way I handle situations like this is to dust a two-part primer over the fragile area, using a fast catalyst and fast reducer, so it doesn't penetrate too much. Give it an hour between light coats. try to get about three coats on. Let dry over night, then scuff sand, and start repainting the base and clearcoat.

If you can't sand out the imperfections in the primer, touch up with glaze and then spot seal, before painting. Whatever you do, don't sand through the primer! This is your barrier coat to prevent lifting! (unless, of course, you want to fix it AGAIN!) :-)