I learned about this product here and thought I'd share my results. I "painted" my turn signal and tilt lever plastic and it looks really good to me. Before is the lower pic, after is the pair
I used a tooth brush size stainless steel wire brush, a pick and 1500 wet or dry. I just tried to get the loosest flakes of old chrome and copper off then washed in hot dawn water. BTW, the marker is a 2mm tip bought at Hobby Lobby for $12. Turned out 2mm is perfect to cut the smooth area by the black end without masking.