2-part, thick urethane repair compound liquid combining the properties of rubber and urethane to form a unique, tough and pourable system.LOCTITE MR FLEX 80 (known as LOCTITE FIXMASTER FLEX 80 LIQUID) is a black, 2-part, thick urethane repair compound liquid combining the properties of rubber and urethane to form a unique, tough and pourable system. It's ideal for casting parts that are subjected to corrosion, wear and impact. This product is typically used in applications with an operating range of -20 °F to +180 °F (-30 °C to +80 °C).