I just got done trying out my old sand blaster

on my running boards, now can I still use an etch primer, or should I get epoxy primer? I had planned to use Martin/senour paints (NAPA) to try and cut costs, and have etch primed the cab already, but feel I should be using epoxy primer instead.

I am not sure if I should etch prime on sand blasted parts, or best way to surface prep before primer. Can anyone help? :confused: :confused: I haven't opened the paint yet, I can take it back.