One Shot Hardener was designed to accelerate drying time of all 1 Shot alkyd based paints including: Lettering Enamels, Bulletin Colors, Gloss Enamels and Pearlescent Enamels. 1 Shot Hardener will improve adhesion to most substrates as well as extend color life and increase gloss. Also, will aid in preventing lifting when an automotive clear coat is to be applied over the paint. One 16 fluid ounce can.