cnc painting

I picked up an airbrush "eraser" which delivers very small streams of
abrasive. Thought I'd try etching glass with it. Not a whole lot of
need for other than on/off, as airbrushing intensity is controllable by
travel speed - pretty easy to feather, I imagine. Cut out the letters
in a Coke can, put a candle inside - really productive ideas, no?
<grin> /mark