The Only Reducers We Recommend For Use With The House Of Kolor System Ru-311 Medium Reducer Is Recommended For Use With Our Kosmic Kolor Base Coats, Shimrin Base Coats, Kandys, And Klears. 1 Gallon Ru300 House Of Kolor Voc Exempt Reducer; Ru-300 Can Be Used To Reduce All Kosmic System Products: Kandys, Clears, And All Shimrin Base Coat It Will Not Change The Voc Content Of Any Product It Is Added To, And Will Not React With Any Coating. It Is A Fast To Medium Dry Reducer That Can Be Blended With Other Reducers For Varied Dry Times.