How To Use a Glue Shim on a Challenging Model

Important: Carefully read the technical bulletin and material safety data sheet prior to working with any material. These documents provide important information that will help make your mold making project a success.

For this project, Smooth-On's SORTA-Clear® 40 is used. This material has a 100A:10B by weight mixing ratio. Using an accurate gram scale, measure out Part A. Prior to measuring Part B, it is important to shake or stir the material thoroughly. Then using an accurate gram scale, measure out Part B. And then combine Parts A and B. Trhoroughly mix the material following the instructions outlined on the technical bulletin.

For best results, and to eliminate the most air bubbles from the thick silicone rubber, SORTA-Clear® 40 is vacuum degassed. Vacuuming the material should be done at 29 h.g.

Slowly pour the SORTA-Clear® 40 silicone over the original figurine in the mold box. SORTA-Clear® 40 should be poured until the top of the model is covered with at least 1/2'' (1.25 cm) of mold rubber. Allow the SORTA-Clear® 40 to fully cure (16 hours) prior to demolding. Once the SORTA-Clear® 40 has cured, the mold box can be removed.