Using a soft fuzzy disc on a spinning arbor doesn't seem like something you can get hurt with, but it's easier than you think. First and foremost is a breathing filter. The polishing process puts a ton of dust and compound in the air, and it's just not good to breath it, so even if you're only doing a few pieces at a time, wear a filter. George uses very expensive full masks with circulating air systems that provides fresh cool air to breath and keep him cool. A good charcoal filter is all the hobbyist needs--the one George is wearing in the photo is a standard charcoal filter with face shield. Safety glasses are mandatory. George also wears a full head sock, just to keep his head clean.