Entropy Resins Super Sap CLR Epoxy Resin 1 Gallon (128 oz.) Professional Grade Surfboard Epoxy Formulated for use with Entropy Resins Super Sap hardeners Go Green: Entropy Products are a green alternative to competitors. We use environmentally sustainable ingredients to compose our epoxy which helps reduce our impact on the environment. This eco-friendly epoxy has an excellent viscosity for hand layup techniques and employs an air release package to ensure smooth coatings. Designed for colored substrate applications, added UV stability makes it ideal for epoxy clear coats and low yellowing finishes. Can be used with CLS (Slow Hardner) or CLF (Fast Hardner)