Hi guys thanks for the replies,Datrotor i dont plan to use that cheap way off doing it being that mag polish im going to use the sissal disk then the polishing disc.I just thought it would polish better and be less work if i sanded the parts first,i used one off those vibrating sanders and to tell u the truth even using 120 grit it hasnt left any noticable scratches and made shore that i went in the same direction.