I'm finishing up the first phase of bondo on the doors, hood, fenders and grill today.. I should be ready to spray the first coat of primer tomorrow.. Then I'll go back over it and find any new spots that I find... what grit do yall recommend for sanding down the few coats of primer? Like the 360 or what? I'm going to go over ALL of the pieces with epoxy with like 180 before I spray the first coat of primer...