I heard that.
We had a metal door at work that squealed for YEARS. Tried everything to get it to stop. WD40, graphite, PB blaster, Vaseline, penetrating oil, used motor oil, that son of a bitch would NEVER stop squealing.
Went to SEMA 2010 and was given a small spray bottle of it. Tried it on that door when we got back and I shit you not, less than a fingernail's worth of that shit stopped it DEAD from squealing and hasn't made ONE PEEP since. It also stopped the wheels on my garage door from squealing, the door on my shed, and a ton of other crap. And that was the sample can. I have since bought a full case of the full size cans.
I'll never buy anything else again.