I recall someone asked about paint applications to glass. While just
looking at a Dick Blick catalog, I found a "glass chalk". it says it
won't run, but it is easily removed with a damp cloth.. Their www
location is: http://www.dickblick.com
or e-mail: info
or phone #: 1-800-621-8293
If you are wanting to know about painting on glass with vitreous paints,
which are permanent, I could give you some information on that as well.