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Double Shield, Liquid Glass Coating for automobiles apply instant glass layer protections and shine on your car. Leading edge Glass Coating coating technology enabled easy application without professional equipments. Glass layer will last as long as one year and Silicone rein layer will last at least 3 months. With repeated use of Double Shield, the glass layer thickens on car surfaces. This thickening further increase car surface strength, protection, durability and luster. These effects cannot be expected to car wax.