It seems to me that there are two lip areas that need to be defined as well as maybe kept apart: * the outer area in contact with the rim * the inner area that is vibrating Maybe these two areas should be discussed separately? The air that we exhale contains water. This has always been enough for me. I need to keep my playing simple, and thinking about licking lips all the time is nothing I´d like to add to my playing. My inner area is wet enough that way. I also have a moustache, and sealing against the rim with wet, outer area hasn´t been a need so far. In my case the moustache is in contact with the rim, and the sealing off is still good enugh. There also are those who think that a wet, outer area makes the mp slide around to much.