Rebound™ 25 & Rebound™ 40 are easy-to-use silicone rubbers that self-thicken for making brush-on molds of almost any model. Rebound™ can be applied with a brush or spatula to vertical surfaces without sagging and will cure to a soft, flexible rubber. Rebound™ 25 is good for making molds of models with deep undercuts and, depending on model configuration, can be inverted as a glove molds. Rebound™ 40 is harder and less flexible. Adding Thi-Vex™ Silicone Thickener allows for the creation of registration keys and cut shims in the mold.