I was asked by a guy in my hangar who has a 912 if he should put anti-seize on exhaust studs. I told him I thought he should. Then my spider sense started tingling and I started to wonder if that could make the whole stud and nut turn out under vibration. Perhaps I should have just said the 3 words that men find so hard to say: "I don't know". There is apparently nothing in the Rotax manual. What do people do on lycomings? Any rotax guru's out there that can comment? If he loses a stud in flight and things get burned up I think he will be upset with me, and probably for good reason.