Universal Urethane Flex Additive is designed to increase flexibility, impact resistance, chip resistance, and UV protection in Transtar two component (2Kk) urethane products. Universal Urethane Flex Additive mixes easily and does not affect dry or cure times. It also increases the adhesion of coatings on plastic parts. Universal Urethane Flex Additive is not recommended for use with non-urethane 2Kk products such as 6441, 6464, 7241, 7244, 7261, 7264, 7271, and 7274.