A Catalyst for all types of finishes. Our KU-100 catalyst for use in Kosmic Klear UC-1,Kosmic Kandys coded UK, and Kosmic Urethane Enamels with UB code. This product must be mixed prior to use. The KU-150 is a multi purpose catalyst for urethane finishes. It is used with KO-SEAL II Primer Sealers, UC-35, and UFC 35 Kosmic Klears.The KU-190 catalyst is for use with UFC-19 Komply Klear II only. This product must be mixed before use.Our KU-500 catalyst is for use with our Polyurethane finishes.