If you are referring to that red goop in the tube. Hate the stuff. Using 2 part glaze, stuff that is like thin filler. But yeh, probably just as well to do it as you said. Sanded through to the filler many spots anyway....As for primer, not doing epoxy. Going to continue with Rustoleum 'ultimate primer' spray bombs. Been using it since I started this project with no issues. No point in doing anything different now.