320 is too course IMO just for adhesion. If you need to remove a lot of material or wear that’s one thing. 400 at the most then finish off with 6-800 before spraying. I almost never wet sand my basses. Also, I like rust oleum or duplicator auto paints. Rust oleum makes a great sandable auto primer. They carry it at harbor freight if you have one nearby. You barely have to touch it with 800 dry for a super smooth finish (as long as you prepped well).I have a hollow danelectro type of bass that is already black and a previous owner had installed a thumb rest and then removed it and filled the holes with epoxy and sanded it so now there is a pretty large area where the black is sanded thru to the primer. I'd like to just spray a coat of black over the whole top - not refinish the entire instrument since its older and well used but just get the splotches off the front and spot touching up has not proved something I'm good at 8>) so the question is if i want to spray black over the whole front, what grit paper to knock down the existing finish so I'll get good adhesion? I've read everything from 320 to 600 wet sand. I will use a rattle can and dont plan a clear coat over it - again going for a consistent black finish not a new guitar look. Any advice on sanding/prepping and brand of paint for gloss black would be greatly appreciated!
good luck.
