Optimum Opti-Glass Coating 30cc Durable windshield and glass coating provides unsurpassed protection, water sheeting and rock chip resistance Optimum Opti-Glass Coating lasts up to a year and is incredibly easy to apply! Opti-Glass Coating forms a durable, cross-linking bond to glass and other silica-based surfaces, providing the utmost in chip, scratch and mar resistance. Opti-Glass Coating forms a durable, cross-linking bond to glass and other silica-based surfaces, providing the utmost in chip, scratch and mar resistance. Optimum Opti-Glass Coating creates such an immense amount of surface tension on glass surfaces that water will simply bead up and roll off at speeds above 35 mph, rendering your windshield wipers virtually useless at highway speeds! 30 cc Bottle - Made in U.S.A.