I've used a lot of rust busters, and I live in NE Ohio rust belt - silikroil is much better than pb blaster or wd40 or anything else. The website is cheesy, and the stuff is pricey, but I'm telling you this stuff is the best. By the way, I have no connection with these silikroil people, I'm just telling you it is far better than anything else, from my experience...

is this like stuff to get rusty bolts off?

YES!! I guess I wasn't too clear.. But yes, it is a penetrating rust-eater type thing. I bought a gallon jug and use it in a small spray bottle, only when the job calls for it.. I don't want to waste it. You can get it by the case in aerosol cans, I co-worker bought a case and gave me one to try. Some of you guys can maybe get together and split the cost of a case. Just a thought. I like the smell of it too.. :) Mike