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Sanguine reacted to Jeff Longtin in How to fix leaking plaster mold?
Sometimes I combine mold parts to test out new design ideas. Sometimes the mold parts do not fit well together. I find filling the small holes/gaps with slip, FROM THE OUTSIDE, to be a simple remedy. Let the slip set up for a few minutes and you have a "sealed" mold. THEN fill the mold cavity with slip.
You can also fill the gaps from the inside but I find it hard to get my hands inside smaller molds.