Well it works for me and ive bent the shit out of my plastics and no crack, chip or anything. So I wouldnt go boasting your "best" way to do it, its more like the way you prefer to do it. And the paint sticks to the primer just fine, fusion sticks to plastic with no primer, so sanding it to 1000 isnt hurting anything. Anyway about someones clear coat question, we have put rust oleum clear coat over fusion with no problems.