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I have painted windows using liquid tempera, which can be too runny, thickly
mixed powdered tempera (with soap mixed in) which flakes off when dry, and
finally tempera cakes, with a drop of dish detergent squirted on top. The
tempera cakes work best for me, as long as you get them thick enough to
stick. I have had great success with the cakes, and now those are all I
use. The best part of using the cakes, is that they are not as messy, you
don't have to use separate containers to mix the paint with the soap (which
helps the paint stick to the windows).
> A classroom teacher has a room with windows that look out at a lovely
>brick wall. She wants paint the windows at different times through the
>year. Apparently, the last time she used tempera, it was rather runny. Any
>methods for thickening up the paint for temporary window paintings?
> Thank you!
>Anne C-H in the Illinois cornfields