Use a good 2 part primer like International 262 black.Feather it down and play with top coat colors.If you dont like the top coat colors you can sand back down to primer and try again.This way the frame is protected and if you prep properly you will stop the flaking, peeling and rust,which is the real issue.Its spendy but great stuff,youll use it on other projects besides the bike once you start using it.Smells great too.A beer and some 262 and your straight.