Why silicone rubber mold dry outside but wet inside?
Because mold making silicone rubber is a kind of condensation cure liquid silicone, which get solidified after absorbing moisture from the air. In order to provide a significant shelf-life for the silicone rubber, we will dry out the water in the silicone rubber.
The way to solve this problem:
Add 0.05% water into the silicone rubber and stir over a low speed briefly when you use it.