Many of you probably already know but I am posting because I could not find this information on any google search or here on this forum.

The Rotax 912ULS manual specifies Loctite 15378 anti-seize for use on the exhaust system but as near as I can tell, that product is not sold in the USA so I emailed Henkel tech support and here is the response I got:

This product is similar to our Silver Grade Anti Seize here in the US. Part #76732 is an 8 oz brush top bottle but there are many different sizes to choose from. This product is also known as Loctite LB 8150 which may make it easier for you to locate.
Loctite LB 8150 is much easier to find and is even available from Amazon.

Scooby