Rebound™ 25 is an easy-to-use platinum-cure silicone rubber which self-thickens for making brush-on molds of almost any model. Mixed 1A:1B by volume (no scale necessary), Rebound™ rubber can be applied with a brush or spatula to vertical surfaces without sagging and will cure with negligible shrinkage to a flexible rubber.
Rebound™ 25 is soft, flexible and is good for making molds of models with deep undercuts. Depending on model configuration, Rebound™ 25 can be inverted as a glove mold. Rebound™ 40 is harder and less flexible. These products are compatible. For example, you can apply two coats of Rebound™ 25 and back it up with two coats of Rebound™ 40.