If it were me and the pitting wasnt a structural issue(If it is take Ray and techs advise). Id skim the pits with regular body filler first. Block that down then prime with a high build urethaine primer like Clova prime 55 (dont know if you have a cloverdale paint where you are). Then wet block that down with 320 (If you use a guide coat it will tell you when the frame is completely sanded). You can them paint on top of that as long as it is a single stage 320 is fine enough. Be sure if you break through with the urethaine high build primer you need to atleast spot prime with an epoxy/sealer. Not a bad idea to just shoot a coat of epoxy sealer on the hole thing before you paint.
Hope this helps
Last edited by prostcelica; 12-19-2012 at 08:58 PM.