For metal bodies I have a good one.
Uni-PAINT markers, anyone that's been to a junk yard knows what i mean, they mark on anything. pick up an oil based paint pen anywhere you want in whatever colour.
get it flowing good, dab it over the area you want to fill. wipe away excess paint with a dry cloth. let the rest dry.
I used rubbing alcohol to remove the excess paint, it won't hurt the body, or the stock paint.
wipe lightly to remove the surface paint, looks great
