This product is for use only in House of Kolor’s Ko-Seal® II, UC & UFC Klears (including UC35 and UFC35 Kosmic Klears). Due to its unique chemistry, KU150 should never be substituted with other brand catalysts. It’s a multi-purpose, VOC-exempt catalyst for urethane finishes, designed to provide proper cross-linking with HOK resins for excellent chemical, fuel, and water resistance. Mix ratio is 2 parts clear : 1 part catalyst : 1 part reducer. This product must be mixed with other products before use, and is not to be used on its own