With just a couple of swipes of micro-grit sandpaper, we were able to buff out the marks—and woodworkers will typically want to finish up with a micro grit anyway for the smoothest finish.

Variations include: Abrasive material used; Type of backing; Format (sheet, belt or disk) for specific sanding machines. Grit ...

Then, it’s off to sanding with 200 and 600 grit wet sandpaper. Slowly, the soldermask is removed and the top copper layer appears. After that, it’s just a matter of sanding and scanning ...