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I'm collaborating with a metal artist doing figurative work and want to make a part of the figure out of glass. She can provide a plaster mold. Can I use insulating cement in that mold and then drape my glass over that? Or would you suggest some other material. I have lots of books but finding it confusing.????

To drape over you can use any refractory castable that shrinks more then glass (it must handle the heatup temperatures and process). Regular plaster/silica and variations meet this spec. I do not know about other castables.