Prepping my car for epoxy primer... It's already been glass-bead blasted and I understand that I should DA w/80-grit to give the surface a good scratch for the epoxy to adhere to. But the blasting didn't get the seam sealer and I'm finding that a wire wheel, though it gets the SS and the rust underneath it, leaves a polished-looking finish. Is the surface cleaned with a wire wheel rough enough for good epoxy adhesion and, if not, what are the best options for roughing up tight curves and seams? Does the wire wheel need to be followed up with sanding by hand to get the proper scratch?