When applying pipe joint compound, a.k.a dope, does the application of tape (Teflon tape etc...) not hinder a chemical bond between the compound and the threads, or is does the compound merely serve as a filler, albeit one that withstands high pressure?
Here is a new threaded water fitting where I noticed a slow leak:
I have a suspicion that the problem here is too much tape (someone did this before me), and I will take it apart and redo.
But what's interesting is that it seems there is water escaping at both ends of the threaded connection. This suggests the water is traveling under the tape to the far end as well.
Could pipe compound over tape have avoided this? Does this not make the case for compound-only?
This question, What goes on threads first: tape or dope? has answers either way, and comments arguing for or against each. It all seems based on valuable experience, but there is no mentioning of the science. And youtube videos on this topic go either way, or are indifferent about it.
To clarify the specific question in light of that and other similar questions: if the water is leaking under the tape, is compound -which goes over the tape per manufacturer's recommendation- the right remedy?
But I think the answer is in the comments: the taping is poorly done, and either it should be re-done, or it should be doped. No need to do both, this is an application failure, not the wrong choice of method.
Is this question a duplicate? No.
Other questions (see here and as linked in the comments), address when either of the two are required, yielding many contradicting answers.
My specific question asks about what happened here in my fitting (drops despite tape, no dope), could it be avoided with dope, and wouldn't dope alone be better than tape since tape is the point of failure here. And whether the tape would hinder a chemical or better compound bond (no it doesn't, a compound seal is not based on a chemical bond).
There are many valuable insights in the comments and in the answers, some reflect the sentiments and facts in previous questions and some are new.