Then I discovered a product called Crystal Craze.  It was a thin paint for glass that crystallized as it dried. I removed one panel at a time and used liquid lead to outline a pattern on each one.  The design was then filled in with various colors of Crystal Craze.  It takes a fair amount of pressure to squeeze liquid lead from a tube so it is not something you work at for long periods of time.  The glass also has to be squeaky clean or the lead will not form a bond and the paint will seep under the lead to the ajoining section.  What I'm pointing out here is that this took some time to complete.