MoldMaking Tips: Thickening Rubber for Brushed On Molds

In this tutorial we cover some basic thickening tips for making 74-20 brushed on molds. 74-20 is a liquid rubber that may be used for poured molds, such as veneer stone molds, or thickened with PolyFiber for brushed on molds. Here’s the webstore link to the 74-20 kit shown in the video: Here’s the PolyFiber thickener. A 1 lb bag will thicken ~2 gallons of rubber: