A note about Krytox. I believe it is so dang expensive, not because it is some sort of crazy, made from Unicorn tears and Tibetan orchids kind if thing, but because it meets some really stringent space/NASA specifications. That's what we use it for at my company, anyway. It carries certain space and military certs, but isn't otherwise that big of a deal. I recently purchased a 125mL (4 oz) bottle of some stuff from a competing company, that was hard-spec'd by my customer, that cost $2,080 and took 6 weeks to get delivered. Space rated = expensive.