I wash with as hot of water as I can stand, with dawn in it. Then use wax and grease remover. No such thing as over kill, when it come to prep work before paint. I would then wet sand with 400, on the epoxy primer, then put on 2-3 coats of blocking primer, then dry block sand it, then more blocking primer, and more dry blocking. Once I had it as flat as I think I can get it, then I would wet sand it agian with 400 to 600, then spary my sealer then the BC/CC or single stage, what ever you choose. but that's just me.
