If you are casting a two-part silicon mold and you want to avoid the two parts adhering to each other, you can use Vaseline and mineral oil, in a 1 part Vaseline to 4 parts mineral oil ratio, which will produce an excellent release agent for this type of application.
However, you must only apply a thin coating since this release agent will become a contaminant if applied too thickly, causing the silicon resin to not polymerize.
We suggest validating your technique before moving to production.