Done it hundreds of times. But if you have sprayed penetrating oil the water becomes less effective.
Heat bolt and spray water on it. Heat will burn the penetrating oil off, water will break down the rust. The heat/ cool process expands/contracts the parts. Its slow but works almost every time. I cut off an air hammer bit and drilled a countersink in the end, so it will stay on the end of the bolt.
I know stuff like this can be a bear, it will come out.
i posted a couple videos about this, one was a stuck brake rotor, other was a manifold bolt. Control arm bolts arent that easy.
