How to Make a 2-Part Silicone Mold

Build a mold box. Seal seams with hot glue. Secure with a mold strap. The model must first be partially embedded in clay. Begin by building a clay bed inside the box. Press the model into the clay bed until only the top half is exposed. Use more clay to fill in any open spaces. Level the clay surface to the model's midpoint. Flatten and smooth the clay surface. Embed small acorn nuts in the clay; reason: creates registration keys between mold halves.
In: How To, Sculpture
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