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Jeff Longtin

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    Mold making, slip casting, porcelain,

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  1. Nata, Pinholes in casting slip are the result of too thick a slip. Its a delicate process but you can thin a slip two ways: adding more water or adding more sodium silicate. If you add too much water you may see more cracking in the mold. If you add too much sodium silicate you may see the slip gel up too much. Thinning the slip with water is usually the best "first step". Another trick is to moisten the mold surface with water before casting. This was a trick given to me by a doll maker many years ago. good luck Jeff Longtin
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