Auto body repair & detailing: sanding one-part acrylic lacquer primer, acrylic lacquer, stone chips

Question
how do i sand a one-part acrylic lacquer primer?

Answer
If you are sanding primer you sprayed over bondo, and using it to fill larger scratches from sanding filler, then block sand with 180. Follow up with a little 320, then re-primer. Block sand over any spots you sanded out scratches or stone chips with 320 dry, then re-prime. Once the primer has dried, wet sand with 400 wet if you are going to use enamel topcoat, 600 if you plan to use pase coat clear coat paint of any sort. Bill