Abstract: Two profile sections (5,6), such as two sealing, trimming or finishing strips for use in motor vehicle body construction, are joined together end to end by use of a heat-sensitive foil (24) such as made of thermoplastics material. The profile sections (5, 6) are clamped in respective retaining devices (18, 20) and the foil (24) is unwound from a roll (22) into position between the facing ends of the profile sections. Heaters (26, 28) are moved into position for heating the foil (24) and the ends of the profile sections and are then withdrawn. The two retaining devices (18, 20) are then moved towards each other so as to move the ends of the two profile sections into contact with opposite sides of the heated foil (24) which thus heat-bonds the end of the profile sections together.