@dogfishlake thanks! I painted the parts on Saturday and they have 4 coats of base metallic. Do I need to sand them again with the base coat on? Or just hit them with 2-3 coats of clear?
Just do the clear. Ideally you should clear a little sooner to make sure the two adhere, like maybe an hour or so, but it should be fine. If you sand metallic it will kick the fine flakes around enough to make your sanding marks show. It may not hurt to scuff lightly with a grey scotch brite pad (auto body supply store) because it's about 320 grit and won't likely hurt anything but you really should be fine without. Being a spray can there is no real hardener so the solvent in the clear should soften the base coat enough for good "bite".