Hi. I took my brass back flow preventer off my irigation system because I noticed it had a slow leak. I had used teflon tape so I went to the store and was given pipe joint compound and used that instead. Now it is female brass thread to male pvc thread, the pvc is the extra thick stuff.
However I just read the back of the pipe joint compound as I was putting it away and noticed it says do not use on plastic.
Whats the deal here, is it just because it might break if I try and undo it, or is it going to eat through it?