Cured In Place Pipe LA. Cured in Place Pipe Lining is a trenchless technology used to rehabilitate the underground infrastructure of Los Angeles. The cured in place pipe lining system from Perma-Liner uses a felt liner impregnated with 100% solids epoxy and is environmentally friendly. If you live in Los Angeles and have questions about cured in place pipe lining or the Perma-Liner system, please call us right away!