Abstract: The invention relates to the formation of a tube (34) and the provision of the tube (34) to line a host pipe and hence repair and/or strengthen the same. The tube is formed of a web (10) of material to which at least one wire strip (18) is applied such that when the web (10) of material is introduced into the host pipe, the at least one wire strip is located at the overlapping longitudinal edges of the web (10). The tube (34) is expanded to the internal size of the host pipe and electric current applied to the wires in the wire strip (18) to heat the same and bond the overlapping edges together.