Gregg Burgard explains why you may want to consider using multiple types of rubber in one mold. Gregg also demonstrates how to pack a mold using two types of silicone rubber.

A Mold Rubber Selection Guide for Jewelers: https://tinyurl.com/22br66ks

Check out the products in this video:
• Mold rubber: https://tinyurl.com/ycke4vp7

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