I use the stendec on my air forks. I believe it is silicone grease so it doesnt mix with the mineral fork oil which is what you want it to do so it doesnt get washed out and thicken up the fork oil.
It’s a bit more gloopy than normal clear silicone grease and is a yellowy/brown colour. My local shop (bad ass bikes) uses their stuff so I just picked up all my servicing stuff from them. It’s a couple of £ more than you can get bike/car stuff for but it’s not like I go through loads. The only one you use lots of is the damper one but a bottle still lasts 4 services and I’ve barely made a dent on the grease and everyone says my forks feel nice and plush (Revs and rebas) so it seems to work well.