a tubular liner , for lining the inner wall of a pipe , comprises a plurality of composite liner tubes , each liner type contains an inner layer of a resin - absorbable sheet and an outer layer of hermetic plastic film . the composite liner tubes are joined by spirally stitched abutting ends . in an embodiment , the inner resin - absorbable sheets are joined . an adhesive can be applied to the inner and outer walls of the resin - absorbable sheet along the stitched spiral seam .