I think your right about the belts getting clogged. The dark areas are smoother and shinier than the light areas so I would assume the dark areas are where the belt is clogged. Is there a good way to unclog and sharpen the belts without leaving a residue?
I think I am going to try Scotchbrite nylon mesh sanding pads as I have had a lot of trouble with hand sanding so far and keepimg the lines in the bevel crisp.
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