Bonding is the technology of future in the modern automotive industry. There are tailor-made adhesive systems for nearly every application in the construction of vehicles. One-component epoxy adhesives are used for spot-weld-bonding of the automobile bodies. AEROSIL® R 202, AEROSIL® R 208 and AEROSIL® R 805 are the thixotropes of choice for this special technology. One-component polyurethane adhesives, thixed with AEROSIL® R 202 and AEROSIL® R 208, are used to bond body parts made of glassfiber reinforced polyester resins.Another important application is the direct sealing of windshields and side windows. One -omponent polyurethane windshield adhesives/sealants were introduced in the 1970s, and remain standard practice today. AEROSIL® R 972 and AEROSIL® R 202 have been used successfully for many years as thixotropic and reinforcing agents in windshield adhesives.