I have plastic water piping. I have an outside freeze-proof faucet
connected to this piping that I want to replace. Wouldn't you know
that the male end of the metal faucet threads into the female plastic
pipe such that the result has my faucet bib pointing straight up. When
I back off the connection in order to get the faucet to point
downward, the connection leaks.

I have heard I think that there is a glue or some such that one can
put on the threads in a case like this - let it set (set up) a while -
which will harden and be leak proof. Is there something? Should I
use it?

Thanks

Duke