Eject-It Petrolease by Price Driscoll in a 12oz Can. Essentially this is aerosol Vaseline / Petroleum Jelly. It has a multitude of release uses and can also be used to make split lines in silicone rubber. As the can advertising suggests, it can almost release anything from anything!
If using as rtv release agent where either casting rtv in rtv silicone or indeed making a two or more part mould, it is recommended to be fairly heavy with application, heat it to flatten and if required brush away any pooling. also saves making up home made release agent for the same purpose!
Keep at room temperature for best application.