In their external appearance, they are all to some extent unique, the windshield and stationary window glass on all models are sealed with a special butyl compound, and removing the existing sealant-which holds the glass securely in place at the windshield's top edge and at the sides of the other windows-requires an electric knife manufactured specifically for this purpose; installing new glass likewise is no easy task. Thus, it can be concluded that no home mechanic should attempt to perform the removal of stationery glass. In case replacement is required because of breakage or leakage, it is preferable to turn for help to a dealer and a skilled glass or body man.