From what i've seen, it dosent really need alot of work. I shot him a PM last nite and told him that a coat of primer first should tell him what to do next. If he uses the filler primer it should eliminate the need for additional sanding but if he wants to go nuts, I've used 1000 Grit on a wet sanding block for autobody patches, i'm pretty sure that it'll work here too but I think that might be over kill.