The disclosure relates to a molding member, for instance for automobile windshields, formed at least partly of an extruded body of a synthetic resin material, as well as a method of manufacturing such molding members. The molding member has an integral lip section in the form of a ridge which extends throughout the entire length, as well as a core element embedded in the main body to extend into the lip section. Typically, the lip section bears against the outer surface of the window pane along the upper portion to form a flush outer surface along junctions between the upper edge of the window pane and the body panel, but is spaced therefrom along the side portions to define a weir. The weir is formed by plastically deforming a predetermined portion of the core element. The weir prevents flow of rain water across the molding member and around the side of the vehicle the driver's or navigators' sight through a window.