Hi: Goggles and dust mask are essential, and so is dripping water as
lubricant and coolant. The water drops keep the glass cool and also
protect and lengthen the life of your diamond and/or silicon carbide
burrs. I use only rotary tools (Dremel and Foredom) and try to stick
to diamond burrs, in the long run they are cheaper and last much
longer than silicon carbide burrs. You can easily rig up a drip
system (i.e. scrounge from your community hospital a disposable IV
setup. I recommend water as opposed to other lubricants - because
oil, etc are pretty messy and obstruct proper views of your project.
My 2 cents.
Joe Bokor
@Joe_Bokor2