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Yeah, it certainly feels good to spray a rusty bolt and seems at least - it can't hurt to try. And, that's about all it does - it doesn't hurt anything except maybe your wallet. I've been turning wrenches for 40 years and have not yet ever found any of the "rust busters" to do anything but lube a little. I've tested many times - including PB Blaster. I'l get a bunch of nuts and bolts all the same vintage and all rusted the same. Spray some and not others. Either they all break, or - if they do come off - the ones that I sprayed come off a little easier, that's all. Rusted is rusted and the rest is BS and marketing hype. If you've got a rusty nut that came out with PB Blaster, then it would of come out anyway. Yeah, it's just my opinion, but I worked at three Deere dealerships plus ran my own shop for a long time and work on a lot of rusty and salt-eaten equipment. I wish there really was a "rust buster" - but there is not. And yeah, I still use it -it's an mental addiction. It never works but I'm always hoping it might help a little. Kind of like cigarette smoking. They taste like crap and you always sorta thing the next one might taste good. At least, I quit smoking 20 years ago. with rust-busters - I still have some around. At least with the WD40 - it doesn't eat rust but does make a good thin lubricant. It was originally created to disperse water and does that pretty well too.
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