Smooth-On Rebound 25 Brush On Trial Unit Platinum Silicone Moldmaking Rubber *Packaging may vary* Easy-to-use platinum-cure silicone rubbers which self-thicken for making brush-on molds of almost any mode 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. Advantages Over Urethane Brush-On Rubber: (a) Rebound will not stick to most surfaces, so surface preparation is minimal, (b) Two liquids that mix easily together, (c) stands up better to production casting of resins and low temperature melt metal alloys and (d) has a long library life. Will not work with modeling clays containing sulfur under any circumstances.