In order to remove car dents with reusable electrode, you will need to remove all of the paint first. For this project, you will need a sander, an electrode, and a hammer or mallet.
Make sure that you are wearing your protective gear (i.e. goggles, respiratory mask while removing paint, etc.), before you attempt this. Place the electrode on the damaged area. You should work from the first point of impact to the last point of impact. Hold the electrode in place, and send a charge. After you have done that, you will need to hammer down the high areas with your hammer. You should be pulling out the lows and hammering in the highs.
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