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I needed to do some exhaust work on my 1993 car. If you've ever seen nuts and bolts on a 16-year-old exhaust system, you know that they are so caked with rust that they barely resemble nuts and bolts. I looked at the nuts and bolts on my car's exhaust system and thought that I would have to cut them off, and cutting was going to be a LOT of work.
Then my wife convinced me to look at penetrating lubricants and I found PB Blaster "penetrating catalyst." I bought a can, sprayed it on the rusty bolts and -- unbelievably -- I was able to unthread them. The bottom line for me is that a $6 can of PB Blaster...
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