i am doing some repairs on my nova rocker panel. the car is painted in a single stage urethane with epoxy primer. i ground down the rocker in the needed areas and welded in some patch panels. i did my body work and epoxy primed the rocker. i have some small pin holes from the filler but the epoxy layed down nice. my question is can i block down the primer and spotty putty the pin holes. if so what should i top coat the spot putty with can i use the epoxy? if so the next step after blocking would be my single stage top coat after the prep. or due i have to use a urethane 4 to1 primer over the epoxy and spot putty. what is the best spot putty to use over the epoxy primer.