Finished edges of plastic products need rounded corners and should be polished.
Edges are easily smoothed with abrasives. Sanding can be done by hand -
or by machine -
Note - The dust created by sanding plastics be hazardous. Some is a skin irritant (fiberglass). All plastic dust is dangerous to breathe. When working for extended periods of time, precautions should be taken. Proper ventilation, protective clothing, eye protection and dust masks should be used.