Channel shaped sealing strip with divergent side walls and formations of cellular material

A sealing, trimming or finishing strip, such as for mounting on an edge flange defining the frame of a closable opening in a motor vehicle body, comprises a channel-shaped gripping section 32 of extruded material incorporating a embedded metal carrier 36 and defining inwardly directed lips 48 (50, figure 1). At least the lips 48 on one side of the channel are of triangular shape in cross-section. All the lips 48 (50) are made of cellular material, such as a sponge or foamed material. In order to mount the strip on a flange, its side walls are initially splayed apart so that it can be mounted without damage to or distortion of the lips 48 (50). After mounting, a suitable tool is used to press the side walls into a generally parallel configuration so that the lips are in sealing contact with the side faces of the flange.