How to reduce bubbles: 1. Warm your resin before using it. 2. Mix the resin and hardener slowly and deliberately. 3. After you've completed mixing the resin and hardener together, let it sit about 5 minutes. How to demold: 1. Use mold release to keep the resin from sticking to molds, and it is nice for prolonging the life of molds as well. 2. After your resin pieces are completely cured, pour some soapy water into the mold. How to clean resin molds: 1. When finished with your silicone molds, wash it with warm water and mild soap. 2. Use a soft cloth to wipe clean. 3. Make sure your molds are completely dry before storing them. How to store resin molds? 1. Place on a flat level surface 2. Store in a cool, dry environment out of ultraviolet light. Please Notes: Please allow a little error on the size due to manual measurement.