Prime & Paint underside questions

Roger Ram Rod said

A driver to go to local car shows, cruise nights, etc. A day spent at the track wouldn't be out of the question. A three season car that might get caught in a rainstorm. A car for me to enjoy, not worried about resale dollars, no numbers match on it anyway.

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I would just use the por15 and forget everything else. You don't need primer with por15 and unless you really want that factory color on the bottom there's no point in painting over the por15. Personally on my car i just used gloss black rustoleum brushed on.