I have a client here in San Diego that uses the method described above (a liner is installed in the pipe that gets permeated with some sort of epoxy mix). This epoxy/liner then basically creates a pipe within a pipe. This is being used in San Diego as the city's water and sewer lines deteriorate.

PS: no one else finds it ironic that Rex is discussing PVC leaks?

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)