Guys, I painted my Studebaker with PPG's OMNI single stage on top of a couple of coats of primer. I see some thin spots I'd like to touch up and hoping I can just lightly sand around them, feather tape it off and reshoot. I would mix a small amount with reducer & hardener. Does this sound okay to do? I painted yesterday and only noticed the spots now. Also, for whatever reason, the metalic paint is not terribly smooth to the touch. Can I use my buffer with a mild cutting product to smooth it out? Yes...I'm a rank amateur. Thanks!