How to Apply Pipe Thread Sealant
Joining pipe is almost as easy as just threading it together. However, pipe that is only joined by the thread without any pipe thread sealant can leak. The pressure of what is carried in the pipe, water for instance, will eventually work its way through the threads to the outside. Once a path is established, you will have a steady leak. You can apply pipe thread sealant easily and create a seal on the threads that will be leak proof. Does this Spark an idea?
Instructions
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Peel a small amount of Teflon tape from the roll (but do not cut it off the roll yet). Teflon tape is notorious for folding in on itself and becoming unusable so keep the free edge stuck on your thumb to hold the tape flat and wide.
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Press the free edge of the Teflon tape to the bottom of the pipe threads. Begin to wrap the tape over the threads, pulling it tight as you go and overlapping the thread at least an 1/8 of an inch with each wrap. You will notice as you do this that the tape will form to the threads, this is what you want. When all the thread is covered, cut the tape from the roll and press the end on to the threads.
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Join the two pieces of pipe together. Do not worry about the Teflon tape interfering with the fit. The tape will compress to form an air-and liquid-proof seal on the threads; this is what you want.
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Tips & Warnings
If you are concerned the joined pipes will come loose due to vibration or pressure, use a pipe thread compound to seal the threads. Pipe thread compounds are similar to glues and will act as such when they cure. There are quite a few on the market and are designed for different applications. Make sure you pick one right for the job. Paint the threads with the compound using the brush attached to the cap and join the pipes.
When joining any pipe, and especially when disconnecting pipes, turn off the the gas or liquid at the main and allow enough time for the pipe to clear before disconnecting it. Not doing this can create hazardous conditions.
