I've used one on brass and plastic models to remove paint and lettering. experiment with scraps before using on an instrument. If the usual aluminum oxide is too damaging, try baking soda--less abrasive but slower. AO can etch glass... .
if you don't have a suitable blast cabinet, use it outside--the grit can get everywhere. Wear safety glasses, old clothes and expect to launder everything afterward. Rinse eyeglasses thoroughly before cleaning or grit can damage the lenses--BTDT.
PS: Harbor Freight has these for much less money than the Paasche or other name brands. Probably not as precise as the latter but unless your work is very detailed it probably won't make a difference.
What abrasives are used in this method?
As seen here, Day 3, 600 grit glass beads:
Baking soda seems like a good place to start.
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