Why does the silicone mold appear to dry outside but wet inside?

 
Because molding silicone rubber is a kind of condensation silicone rubber, which is cured by absorbing moisture from the air. In order to provide a significant shelf-life for the silicon rubber, we will dry out the water in the silicon rubber.

Solution: Add 0.1% water into the silicon rubber and Stir over a low speed briefly when you use it. 

2019-04-25