baby steps forward & a step back - 2K urethane Epoxy primer.

Be careful using Ospho as some epoxies as it can react unless the Ospho is neutralized while wet with water.

Yes epoxy primers are so tough, and stick like ugly on an ape. If you have a DA sander, smooth out those runs!! Use something smoother than 80 grit so as to not leave sand scratches. Remember any flaw you see or feel in that body will magnify when you apply top coat!