As a gasfitter I have some experience with threads, Teflon and dope (liquid thread sealer). One of the first things they teach you in pipe fitting is that Teflon and dope have nothing to do with sealing the pipe, or prevention of leaks. The threads on the pipe and in the fitting ensure the seal. Teflon and dope is used for ease of disassembly. It is a common misconception that Teflon and dope seal the pipe. A pipe, properly threaded, should have 11 threads. After tightening into a fitting there should be 4 threads left exposed.
Also, pipe dope (liquid sealant is an improper name) is made of Graphite dust suspended in a petroleum catalyst. The one in your link has added white colouring.
In retrospect, I would recommend using only white plumbing Teflon on your threads, and proper tightening techniques. You should never have a leak after that. Personally I would use slip with glue and unions. Good luck... and where's the pics?
|