Universal Acrylic Urethane Klear is a coast-2-coast compliant clear, designed to provide optimum flow and leveling in an easy 2:1 mix. UC21 features high gloss and has good chemical, fuel, and water resistance. It may be used to topcoat any House of Kolor basecoats and urethane enamel finishes, including any Shimrin or Shimrin2 basecoat finish. Mix ratio is 2:1 with UA22, UA23, or UA24 catalyst. Pot life is 1 hour at 75°F (shop conditions can vary pot life). It comes in a 1 gallon can.