I was going to do a little wet-sand on them but I held off because I wanted to see how this plasti-dip was going to hold up. So I basically cleaned the chrome real well, dried then applied about 4 coats on both sides. Getting by the side mirrors was the toughest part but all in all Im happy with the outcome. $3.49 at Lowes haha!The plasti-dipped trim came out great. Did you have to prep the chrome strips at all? Car is coming along sweet!!