I hate to disagree with @andysauto1 but if the epoxy is DTM (direct to metal), it doesn't need an etch primer base. Every epoxy I have ever seen was DTM.
True. If you go to Southern polyurethane web site,for example, it will mention do not use their epoxy primer over any etch primer. That concerns their product but just be aware of issues that an always arise with any paint product!
Epoxy primers claim to fame, is their abilty to stick so well to anythng (and sealing ability) but again, pep is always the key.
