I like useing both teflon tape and some liquid gasket. Never had a problem since. Just a dab and all is good.
Oh, and make sure you wrap the tape the right way. Wrap it wrong and its pointless cause your pushing it off as you thread the bolt/adapter/fitting.
Oh, and make sure you wrap the tape the right way. Wrap it wrong and its pointless cause your pushing it off as you thread the bolt/adapter/fitting.