My car was keyed a while ago. I read a method of fixing minor scratches such as these where I would use touch up paint and dab it into the scatch. Then, after about a week, wet sand the area. I have a 2000 grit wet sanding bar, that I tried on a small area, and it was unsuccessful. I made sure to lube the area well with soapy water. Does anyone have advice on how I should be doing this for best results?