Most effective for threaded pipe and fittings. Works in place of thread seal tape. It works because it 'lubricates' the threads so they can be tightened more and also fills in small thread imperfections.
Pros
COMPATIBILITY: Can be used on all metal, PVC, ABS and CPVC lines that carry water, steam, caustic and dilute acids and is also suitable for use with all liquids and Suitable for gases other than oxygen