In my search for some of this stuff I found that VW / Audi have a similar, if not the same, product. Considering their sunroofs are also made by Webasto I figured it was worth a try.
Part number G00045002. No dealer will have this in stock because they just spray in silicone instead
Cost is under $30 for a 90 gram tube.
Looks like Pellican can order it for you
I put some on the tracks and seal of my W126 this morning and can't believe the difference. Sunroof is smooth and quiet, and doesn't bind when going from sliding back to tilting up. The paste is not messy at all. Remember it's important to lubricate the seal as well as the track, I think this is why a lot of the tilt and slide sunroofs have trouble: The sunroof binds on the seal requiring a lot of force to go from tilt to slid back.
-J