Abstract: A recess is formed on a mold for injection molding a molded product body, and communicates with a cavity of the mold. A part is bonded to the recess with an adhesive. In this state, a molten molding material is injected into the cavity to provide a molded product body, and the part and the molded product body are welded together by heat of the molten molding material. After the separation of the molded product body and the part from the mold, the adhesive is stripped from the part.

Abstract: A weatherstrip for sealing the corner and its vicinities of an automotive door, which comprises: an extruded weatherstrip which comprises: a base that contains a relatively narrow hollow portion and is to be fixed into a retainer; and a hollow tubular seal protruding from the base toward the body panel; and a molded weatherstrip integrally molded with the extruded weatherstrip, which comprises: a flat base having a substantially uniform thickness; and a hollow tubular seal protruding from the base toward the body panel, wherein the molded weatherstrip has a tabular insert panel comprising a tip portion and the other portion, for integrally molding the molded weatherstrip with the extruded weatherstrip, so that the tip portion is fitted into the hollow portion of the base of the extruded weatherstrip and the other portion is enclosed in the base of the molded weatherstrip.