Evercoat - Liquid Hardener - 11cc For Quart -.37 oz. - 100602. Hardening agent for use with all polyester resins and gel coats. Plastic squeeze tube has graduated measure for mixing convenience. Use this Methyl Ethyl Ketone Peroxide catalyst according to the resin/gel coat label directions.. Features:. Size -.37 oz.. 11 cc for Quart