Well, if Silca is sold out, there are some pretty fabulous alternatives. My fave:
https://nixfrixshun.com/nixfrixshun-...cle-chainlube/
It does what it says it will do. I first got some from the Nixfrixshun guy at the Hartford NAHBS, which was fun all by itself. I also got the little mini Silca travel torque ratchet set, which has also been terrific. And a chain whip tool from Abbey. And other clever and fine swag. What a great show