The main principle for making one piece mold is the shape must wider to the top, for instance a bowl shape. Minimal has straight line from bottom to top, like cylinder cup. If has curve line in some area, even slightly the model can not release from the mold. It will be stuck.
Another thing must be note is a kind of separator we used. I make separator by myself from white bath soap. The soap is cut into small pieces and cook with little water and coconut oil. The result is liquid mixture. This separator is good enough to me. To apply the separator on the model surface can use sponge like picture in the bottom. The process binding needs several times until has shiny surface.
To release model from the mold, you back mold and struck by hammer. But do not directly must be put the wood first (fig. 5). To hit the mold you must use shock technique, do not use full power. Before that you need put the props, so after hit several times the mold will go down by itself (fig. 6).
To release model from the mold, you back mold and struck by hammer. But do not directly must be put the wood first (fig. 5). To hit the mold you must use shock technique, do not use full power. Before that you need put the props, so after hit several times the mold will go down by itself (fig. 6).
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| 1. Place the model on bat and a gap between model and bat cover with wet clay |
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| 2. The excess of clay trimmed neatly |
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| 3. Use separator |
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| 4. Pour plaster slip |
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| 5. To release the model struck the bottom by hammer (use props) |
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| 6. The model will release after struck several times |
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