Abstract: An apparatus and method for manufacturing a vehicle door barrier or shield for attachment to an inner door trim panel mountable on a vehicle door in which the barrier self-seals the opening between the vehicle door and the interior passenger compartment. The barrier is formed of a resilient gasket material that is shaped or formed with a peripheral rail or spring attachment surface that is compressed as the interior vehicle door trim panel is fastened to the interior surface of the door sheet metal to effect a watertight seal about the periphery of the door. The attachment surface carrying a seal material is disposed in an interference position with the door inner panel when the joined inner door trim panel and the barrier are mounted on the door inner panel. The interference deflects the attachment surface to create a joining force to secure the seal material to the door inner panel.