I ground them down one stage at a time (started with 80 grit then moved down to 220 grit) The grit you start with depends on how rough your bumpers are. The chrome is only the first stage. After that, the nickel underneath needs to be removed. For the final sanding I used used 400 – 600 grit paper on an oribital sander. You then need to buff out with different degrees of compound/polish to get the swirls out. All this I learned from those that charge $350plus for each bumper.
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