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Place rim of the mold on a piece of cardboard.
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Trace outline onto cardboard. (see illustration below)
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Cut out just inside the line (about 1/8 inch inside). (see illustration below)
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Fill the mold with warm water. This will be the amount of water needed with the mixed plaster.
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Pour the water into your mixing bowl. Sprinkle the plaster in while stirring until all water is absorbed.
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Fill mold halfway with plaster and knead gently to release any trapped air bubbles.
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Place mold into the cardboard prepared earlier.
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Fill the balance of the mold with plaster.
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Suspend the mold in a glass or jug of warm water. Water level should be as high as possible without spilling over.
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Allow plaster to harden.
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When fully hard, remove mold from water. Do not dry off.
- Rub a drop of dishwashing liquid over the mold to lubricate it.
- Peel mold off of casting.
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Molds should be washed with soapy water, then rinsed before storing. If storing for long periods, it should be dusted with talcum powder.
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Store in darkness.
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Latex has a memory so do not store molds in a squashed position.