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  1. Is this type of plaster appropriate for a refractory lining?

    This specific casting plaster is only a fraction of the price of plaster of paris and seems to have the same chemical composition i.e. Calcium Sulphate Hemihydrate


    I wanted to replicate the "Grant Thomson - King of Random foundry" (https://youtu.be/hHD10DjxM1g) and I was wondering if this plaster when mixed with sand would yield the same result as plaster of paris?
  2. would a plaster and sand crucible work?

    I recently watched a video of a refractory cement substitute made from 50% sand and 50% plaster of paris. Could this same mixture be used to make a crucible strong enough to melt aluminum?
  3. What is this ceramic "slurry" made out of?

    Hi I'm new here


    this video contains a ceramic "slurry" substance that appears to be really effective at preserving detail for lost wax casting, as well as being incredibly heat resistant. I was just curious as to what it is made out of and whether there was some kind of recipe for it, that can be produced with stuff from a hardware store.

    If it's too hard to obtain, I already have an alternative in which ...