Does anyone know where to get the lubricant included with the Captain Slug hardware kits?

I've tried a number of lubes and greases (Superlube, white lithium grease, even liquid PTFE), and none of them have come even close to the performance of whatever silicone grease/oil I got with my Caliburn hardware kit. I've just about run out of the stuff, and I'd love to know how to get more.

Checking the kit instructions, he recommends Oatey #30219, but that seems much thicker. Regardless if it's good or not, I doubt it's the same stuff.

Any help would be greatly appreciated.