I've got the same Rigid oscillating belt/spindle sander everybody else seems to have. Recently I've been noticing some dark grey marks on work pieces after using the sander. I'm thinking there some paint or something coming off it?
I just cleaned it with water and then alcohol before taking the pictures of this piece of maple. Second shot is the other side, just to show it's not something in the wood grain.
Suggestions? I'm thinking maybe I'll try a coat of poly next.
PXL_20231022_221748223.jpgPXL_20231022_221753071.jpg