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I used a finishing sander for several ABS panels and did not like the results - because they vibrate back and forth, I ended up with a lot of little "v" shaped impressions in the surface.
I think the rotary sander does much better, but if you don't have one, you can just use foam sanding blocks.
I did my latest panels with sanding blocks starting at a medium rough pad and finishing with a very fine pad. These panels ended up much smoother with no unusual marks in the surface.
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