Look for Sculpey wet/dry sandpaper packs, 400/600/800/1000 grit. Auto refinish packs will have far too many sheets. You'll need a 1500 grit paper, though.
Use a backer block to sand down blobs. Blocks of rubber, plastic, or wood work well enough.
I was fortunate to have a professional auto paint dealer closeby that is happy to mix 2 oz. of touch up to match. YMMV. There's no substitute for matching directly with their cards.
If you have a color match, sand down edges of chips to make blending the repair
possible. When you sand a blob back down to original level, you will see the outline of the chip, now filled with paint, if you don't.
Spray primer is cheap and effective. Sand down the tooth on it after the second coat for a smoother finish. Use a hobby brush for small areas to hide exposed metal.
Look for a build thread soon.
