 It must be functional and cohesive with the body design of the vehicle.In addition to factors standard to weatherstripping, additional factors must be considered for vehicles, specifically in the engineering of the parts.For example, the weatherstripping must function the same while the vehicle is parked and at full speed; be flexible to accommodate motion vibrations; endure extreme temperatures of hot and cold; withstand long periods of sun exposure; and resist automotive liquids such as oil, gasoline, and windshield washer fluid (methanol).