I primered, then hand sanded with 200, primered again. then hand saned again with emery(sp, tired) cloth in areas needing bondo.
bondo'd, sanded down bondo'd areas using 60 using and a finishing sander (the fast vibration makes it sand as though it is 200, but I suggest using 80 with a finishing sander).
Really light coat of bondo in areas with deep scratches and poreous bondo areas. then hit it with finishing sander with emery cloth. Primer, then hand sanded dull with 600.
That is what I did to my hood. I'm still deciding color(s).