"3 coats of dupont nason epoxy primer 2 coats of zero rust (prefer the por 15) and 3 coats of single stage dupont omni acrylic urethane, "
Why on earth would you use Zero Rust or Por 15 over the epoxy?
Doesn't anybody read the instructions anymore?
The whole point of these two products is to provide protection to a surface that is not pristine and may still contian rust.
They do not offer anymore protection than a good coat of epoxy primer.