Dianesart Posted February 28, 2021 Report Share Posted February 28, 2021 So I have a plaster mold that has been used about 12 times,bit leakie but it works with extra precautions. After my last pour and opening I had these funky crystals show up on one side. I have been slow drying it between pours by a heater so dont know if this is the cause. Just wondering if this is normal for a large slip cast mold. Have to say it's rather pretty... Link to comment Share on other sites More sharing options...
Chilly Posted February 28, 2021 Report Share Posted February 28, 2021 Normal here. I have a plaster slab that sits out in a greenhouse all year, and when it's damp or cold it grows fur. Link to comment Share on other sites More sharing options...
liambesaw Posted February 28, 2021 Report Share Posted February 28, 2021 Its called efflorescence and it's just the salts from the clay and plaster evaporating on the outer surface. Totally normal, I've had some grow to almost an inch long Link to comment Share on other sites More sharing options...
Mark C. Posted February 28, 2021 Report Share Posted February 28, 2021 Its called efflorescence -just like cave stuff-no big deal Link to comment Share on other sites More sharing options...
Dianesart Posted March 1, 2021 Author Report Share Posted March 1, 2021 Thank you so much for your help and I am super relieved its all ok. Loving this forum! Link to comment Share on other sites More sharing options...
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