its similarity in physical properties such as coefficient of thermal expansion to the glass lamina however the glass mold like the glass lamina will adhere to the plastic unless an efficient release surface is developed according to the present invention a superior release surface is prepared by contacting the glass surface with dimethyldichlorosilane in the presence of water vapor to form a durable efficient release surface on the glass and then cleaning the release surface with a polar solvent to remove the residual hydrolysis products from the glass release surface to prevent transfer of the residue to the plastic surface during lamination resulting in a visible haze glass molds large enough for use in fabricating windshields are treated with dimethyldichlorosilane in a 76 34 u00d7 30 34 u00d7 36 34 galvanized steel spray chamber equipped with a large double door for ease of handling the large substrates which are mounted on wooden racks although as many as twelve substrates may be treated simultaneously it is recommended that about six should be treated for optimum uniformity and durability an opening is provided in the front of the chamber for the introduction of water vapor while an opening in the back is provided to exhaust vapors into a hood small openings are provided at the sides of the chamber for spraying the dimethyldichlorosilane into the chamber glass substrates to be treated are cleaned.