As far as I'm aware, it's just silicone lube so any pure silicone oil/lubricant would also work fine.
I live about one mile from the Hunter factory where they make that stuff, and even then I can't buy it unless through a bike shop or as a registered plumber
Sticky pistons on my hope rx4+ (only a couple months old, kind of unimpressed with them so far).
I can't find the hope recommended silicon stuff here, can I use mineral oil? Or any other recommended substitutes?