My first question is this for your auto and why do you want to paint thr glass. Yes, it is possible but if this is for you auto there are state laws that vary from state to state on how dark the windows can be and what windows can be darken. I would get a piece of glass,it doesn't have to be auto glass from a hardware store or a glass shop and do some experimenting with paint to see what works best for you. You also can buy tinting film that is made to apply to auto windows from an automotive store or look in the yellow pages window.
Several years ago when we had a pet store and 45 fish tanks we used paint pens from the office supply store to write on the tanks. They came in many colors and were like a fat magic marker.
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