Hi Scooby,
FWIW, you actually have multiple good choices for this particular application (S.S. exhaust system anti-seize/lubricant). I believe that there is nothing unusual or different between LB 8150 and many other aluminum-based anti-seize compounds. It's just a common aluminum powder-based anti-seize, good for up to 1600 deg. F. In fact, in my opinion there are better choices readily available through Amazon, your local auto supply store, etc. My favorite is nickel-based (also kind of a silvery/gray color), such as Loctite #77124. It is excellent for use with stainless steel, and is good up to 2400 deg. F. The reason I prefer it is because I've had exhaust system parts, such as slip joints & ball joints seize up over time with the aluminum-based stuff. The extra 800 deg. makes a difference. There are also copper-based products available that fall in a temperature range between these two. They are sometimes not used because of possible contamination of oxygen sensors, which is not a concern for the usual aircraft installation. The nickle stuff is good for most anything, to my knowledge.