MFP -
To get it to look right, you're probably gonna have to do what real auto body shops do. Mask off the entire affected section, like a door, hood, fender, etc sand it smooth or a very good feathering, and repaint that section. Most anything else will look like a repair job. That's why a 1" scratch costs $2000 to fix!!!
Probably some guys here who can do spot repairs on gloss car finishes, I can't. Flat aircraft finshes, they're easy!
Archer out.