I used Evercoat urethene primer surfacer and blocked between coats. Everything is looking good with 400 grit except I sanded through in a few small spots (mostly edges). I lightly coated the spots with Rustoliem automobile primer (black) to keep the spots from getting surface rust while I do some frame work.
My question... should I buy more Uro primer to coat over these spots or is the rattle can primer okay to put bb/cc over?
The Uro primer is buff color, rattle can is black, and the car will be painted black with Dupont products.

Take the rustoleum primer off before painting the car, your painter will use a suitable sealer over the exposed spots before paint application. The rustoleum primer is a soluable product I'm sure and will probably create problems when the color is applied. Bob