Croosh wrote:

It was OK for
microscratshes, but deeper ones it didn't do much good, and using a
drill makes distortion more likely than a flat sanding pad.

Long ago, I worked as a silversmith. When polishing out scratches, we found that
using a buffing wheel in the same direction as the scratch would deepen the
scratch; the compound just ate the scratch out deeper. Eventually it would
polish out, but you took off a lot of surrounding material. Orienting the whhel
at 90 degrees to scratches polished the scratches out with less material loss.
We got the best results by using a rag to remove polishing compound from the
scratches every minute or two.

I suppose it would be the same in this situation.

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.