[MrFlippant]

The crusade is over. Once people saw the light, it all snowballed from there.

As for why it works, I read something online that explained why dielectric grease works, and I think INOX MX3 is doing the same thing. Essentially, by filling in the microscopic gaps of a metal-on-metal connection, the ACTUAL touching metal bits are able to do their job better than if air is in there. Probably reduces arcing and carbon buildup. It also does a great job of cleaning off carbon build up and oxidization as well.

I like the magic explanation better, though.

 

[MrFlippant]

You didn't ask about the US. People assume if not noted, people are in the UK, since this forum has a strong UK contingent.
If you want it in the states, your best bet is 132slotcar.us. There are many places selling it in the US, but not many online. I got my first bottle on Amazon.