I recently purchased a Prince from a respected maker, one of those I think of as The Big Three of mid-level pipe makers, that had some sort of polyurethane finish on it (didn't know that at the time) and was amazed that the finish, a week later, started to bubbly up like a membrane. The vendor gave me a refund; I didn't want an exchange, because I didn't want to go thru this experience again. But how often does this kind of peeling of finish happen? How can you tell if a high finish pipe is coated with one of these urethane finish before finish?