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Among the plastic automotive parts which are finding increased use these days, the bumper is a key large-size part upon which the car depends for collision safety. Its design is important for the car's individuality and attractiveness. Also, its appearance is as important as that of the steel body. To achieve production efficiency of high-quality injection molded polypropylene bumpers, prime considerations are: a tool design to allow molding with an undercut, a tooling process capable of building high precision moulds in a minimum amount of time, manpower savings in the molding operation, etc. Ease of design and quality enhancement are especially demanded for the instrument panel. Conventionally, pads for component parts of the instrument panel have been produced by infusing semi-rigid urethane into the vacuum-formed or slush-moulded skin to integrate with the base material.