EnviroCat Low Viscosity Hardener is an isocyanate based hardener with ultra low monomeric di-icocyanate content for water based finishes to improve hardness, chemical resistance and adhesion. Using this hardener in the 200 series topcoat will increase the gloss of the product 5-10% depending on how much you add. Using Hardener in any waterborne coating gives a pot-life of several hours after which the coating will begin to gel. This product is designed to be added to existing Envirolak products to enhance the performance of the cured finish. In topcoats, it will improve hardness, mar and scratch resistance as well as chemical resistance. Using it in basecoats will improve adhesion and water resistance as well as preventing veneers and softwood from checking or cracking. 1 Quart.