Be carful with clay molds for draping.
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be careful when draping over clay – I have had problems with expansion and contraction. The glass cracked coming down since the clay contracted at a slower rate. You can prevent that by placing a prefired 1/8″ thick fiber paper over your drape mold it acts as a buffer. We use Kaiser Lee Board for our drape molds with great success.
Whenever we have a drape mold we cut a piece of newspaper and fold it over the mold. Is it to big we cut it smaller is it to small we try with a bigger one. The right piece is than used as a pattern. Uneven shapes can drape into beautiful shapes as well.