A short video below from Smooth On on You Tube demonstrates the simplicity of a 1:1 Addition Cure RTV Silicone (like our Viscolo 22) for use with candle mouold making. The addition cure rubber will withstand the heat of the wax better and in addition is less likely to degrade with the presence of Stearics.
One foot note to add to this excellent video is that WAX FLOATS in RTV Silicone! Dont forget to fix it down before pour! A nice high pitch wood screw works wonders from the back side of the base board.