Applying PTFE on the thread of compression fitting is a common mistake for DIYer. Is it necessary to undo the fitting and remove the PTFE if no leak?

[diyman]

I've learned that for compression fitting

• Never apply PTFE tape to the thread
• The water seal is done by the olive (O-ring) not the thread
• Suggest replace olive every time if undo the fitting
• If have to reuse the olive, wrap small amount of PTFE around the olive may help to reseal the fitting

My question is:
If I’ve applied PTFE on the thread by mistake. However, there is no leak.
Is it necessary to undo the fitting and remove the PTFE?
What would a professional plumber do?

 

[breplum]

no issue with leaving it.
Cheers

 

[Bird Doo Head]

I've sometimes used tape on compression plumbing fittings and always on flare refrigerant line fittings.
Reason: So I can take it apart years from now. Especially true if the parts are dissimilar metals.

Be sure to keep the tape off of the ferrule seat. Tape low.