If you dont mind spraying it twice, the best way would epoxy followed by regular primer. But check the can of epoxy, I dont know if it even has to have primer sprayed right over it. i know when you are working with a mixed system, it has to be topcoated within a window.
But once you have the epoxy and primer sprayed, it can sit as long as you want.
Those two things are rust inhibitors. More used on panels that have rust to turn them to oxide. I feel it would be an extra step that isnt needed because you will still have to spray epoxy and primer anyway.
Or you can take a chance and just wait til its done and spray paint right on the steel.... but I wouldnt.
Epoxy and primer is the way to go if you want good looking lasting results with auto paint.
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