In a word, no. Roll-N-Lock is a movable system, making it almost impossible to achieve absolute water tightness. However, properly installed, Roll-N-Lock is a reasonably dry application. Some dripping can occur when parked in a continuous rain. This is generally at the tailgate area. Some applications are more problematic in this regard due to unusual bed configurations. Conditions on the Ford Flareside and Supercrew applications cause the tailgate to be more susceptible to dripping than conventional applications.