Hi thanks,the car had been primed years ago and left outside so the whloe thing had surface rust.So I da the primer off and used Rust B Gone in a spray bottle and a scotch brite pad.Thereally rusty areas I used some muratic acid cut with water(still very strong) to get the rust out of the pits.Then pressured washed the whole car and dried it,then went back over it with the Rust B Gone which is pretty mild non acid.I have it getting the floors and jambs,firewall,wheel houses sand blasted right now.