The areas of glass are secured by the tight fit of the weatherstrip in the body aperture and are bonded in position with a special adhesive. Renewal of such fixed glass is a difficult, messy, and time-consuming task, which is beyond the scope of the home mechanic; it is challenging to achieve a secure, waterproof fit without ample practice. Additionally, the task carries a high risk of breakage, particularly with laminated glass windscreens. Therefore, it is strongly advised for owners to have this type of work performed by one of the many specialist windscreen fitters.