If you look at picture below, the cold water line is on the right. I am having a very slow leak beneath the metal nut at the bottom and the metal threads that come out from cold water supply. It does not drip, it is a very slow leak that could be described as oozing very very slowly. I have attempted to tighten and it won’t budge. I really don’t want to take it off unless absolutely necessary. Are there any suggestions or any products, I could use to stop this leak? I had thought of using pipe sealant, but I don’t know if that is an option here.