What is Automotive weatherstripping ? Weatherstripping is the process of sealing openings such as doors, windows, and trunks from the elements. The goal of weatherstripping is to prevent rain and water from entering entirely or partially and accomplishes this by either returning or rerouting water. A secondary goal of weatherstripping is to keep interior air in, thus saving energy on heating and air conditioning. Where is the weatherstrpping applied ? Automotive weatherstripping is used extensively aboard automobiles, and can be found anywhere the interior compartment must be sealed from the environment. It must be functional and cohesive with the body design of the vehicle. Weatherstripping also plays a part in maintaining satisfactory ride quality in the vehicle, being partially responsible for sealing noise out from the passenger compartment. Automobile flex when going over bumps, and vibrations cause relative motions between the relatively fixed body and movable parts like doors, windows, and sunroofs. This movement could allow water in the vehicle so the weatherstrip must compensate by filling the gap. Furthermore, this relative movement can cause noises such as squeaks, rattles, and creaks to be heard within the vehicle. How much do I need ? Automotive weatherstripping can fail because of age or use.Considering a standard four-door vehicle, the doors require 20 feet (6 meters) or more of material per door, windows require upwards of 10 feet (3 meters), and trunks require large amounts.