JB80 works pretty good to, probably the best, it's a lighter, thinner penetrant, which also helps immensely when applied beforehand, just once or twice, or more, farther ahead is always better, and when you break the bolt, shoot more in and wait a bit if it's real rusty. Imagine what salt does to 12 mm bolts and nuts, and how fast. Smaller bolts that are rusted to nothing?, still soak em, then vice grips or drill, reverse drill if you are into that method, I'm not. Really though, I use both, blaster is cheap and greasier, I've tried it, but you'll find out that the jb80 can lasts a whole lot longer than blaster, like forever, and works better. The stuff really smells though, wear gloves and rag to control it. OH yeah, always use the right tool, I like my 6 points. Bigger stuck bolts?, heat and hammer.
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