I had some previous experience with acrylics on non-traditional surfaces, and then I googled. Other people who experimented found that 100% paint was not translucent enough, which is why the glue is added. It’s possible that the glue is easy clean because it’s for kids. Everything I read said it would come off, so I went out on a limb and tried it. My first run through came out looking not wonderful, so I washed it off and started over, so I at least proved it would work before doing all 3 panes of glass.
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