Well, Just wanted to re-state what has been said here, ATF + Acetone is by far superior to anything else I have used as far as getting off stuck old nasty rusty 20 year old nuts and bolts. I mixed up a fresh batch this morning, sprayed 2 bumper mount bolts, and left 2 unsprayed. This is all taking place on the 1993 dodge I am dismantling, factory bumper btw if it matters. Came back only a half hour later, sprayed bolts came out with ease, no air tools, just my regular sized 3/8 ratchet As far as the 2 unsprayed bolts, Using a 1/2 wratchet It took me a lot of pulling and repositioning just to break the torque, and fought me the entire way off. Took at least 1 minute total, and tired me out for the last unsprayed bolt, well, I figured I had learned enough for the day, and took advantage of the fact that it was in a spot my IR 1/2 impact could hit. Not concrete evidence or anything, just remember the thread about the university study that pitted rust-lubricating oils against each other, and figured I would share my experience. I most likely will not be buying and liquid wrench, kroil, PB Blaster, or any of the like in the future for this purpose. ****BE CAUTIOUS WITH ACETONE VAPORS***** Guys at work clean sealant off there skin with this stuff, I also would NOT recommend that.