Sealing of pipe liners

A method of forming a pipe liner comprising a fabric sleeve with a barrier-coated inner surface and a longitudinal seam, the method comprising the steps of:

• a) providing a sheet of fabric comprising a barrier coating on one side;
• b) bringing two opposing side edges of the sheet of fabric together to form the fabric sleeve comprising the barrier coating on an inner surface of the fabric sleeve;
• c) providing a strip of carrier material comprising a liquid sealant on at least one surface of the strip of carrier material and arranging the strip of carrier material inside the fabric sleeve and in registration with the two opposing side edges of the sheet of fabric with the liquid sealant facing towards the two opposing side edges of the sheet of fabric;
• and
• d) joining together the two opposing side edges of the sheet of fabric with the strip of carrier material and the liquid sealant to form the longitudinal seam in the fabric sleeve wherein the strip of carrier material and the liquid sealant cover each of the two opposing side edges of the sheet of fabric, and any gap in-between the two opposing side edges, to provide the barrier-coated inner surface of the fabric sleeve, and thereby provide the pipe liner.