What's this? Using my machine as a guinea pig? Nah it's cool mate. Looks like interesting stuff. Where do you get it from?
As long as it only eats rust, not the whole machine hey? 
I've used it before on rusted lock down bars. It removes the rust very well and it is safe to use. I soaked the worst rusted screws I could find as a test, and pulled them out after 10 minutes, and I could not recognize them - they were that good. I used a cheap paint brush - more along the lines of a touch up brush - and "painted" on the stuff and you could see the area "foam up" and react immediately. Wipe it off with a rag, and I could not believe my eyes.
Still - it requires time and patience, but I'm confident that this machine will be rust free when done.
