I'm in the process of dying the dash pads in my 67 coupe. The pads are red and not in bad shape overall, but there are some areas of blackish, shaded discolorations. I have dyed pads in the past with great results, but after 2 coats of dye these discolorations remain visable, but to a lesser degree. The pads were thoroughly cleaned prior to application and SEMS prep was applied before the dye. Has anyone encountered similar results and is there a technique or product that could be used that would cover these marks? I was thinking some type of primer etc. Any thoughts?