i just rebuilt my seat box for my back to back seats. i built them out of plywood and covered them with epoxy resin. i plan on paintng them soon with rustoleum oil based paint. but when i made them i did a bad job of filling the countersunk screw holes so i see some indents where the screws are. is there any car bondo type product i can fill and sand before i paint to get rid of them or should i just keeplayering with epoxy resin(which is expensive)