So I replaced the sediment bowl on my MT and I cannot get it to stop leaking. It's leaking where the bowl threads into the tank. I did not put any pipe dope or treatment on the threads that go into the bottom of the tank. Should I? What would I use that can hold up to the caustic nature of gas? I am hesitant to tighten it much tighter for fear of cracking the aluminum bowl or worse yet damaging the tank.