I'm kicking myself on this one already but, I have a customers car that is in 2k primer with some sand throughs and different color primers that were used, the car is blocked out in what feels to me as a 600 grit scratch, I am looking to block it all out with guide coat prior to shooting 2 coats of white epoxy primer. I want to have all in white epoxy before thewhite sealer because its going to get the sublime green mopar color and I'm guessing this isn't a quick coverage basecoat (Wanda HS base). Question is ,is 600 to fine of a scratch to shoot epoxy over 2k primer?