yeah, i have a can of that in my garage from a couple years ago. it's aight. but PB blaster works fine and I use Deep creep by seafoam. that's some good people.
and if you have an impact wrench, you shouldn't need pen. lube. wuss.

i break crap loose on my car(s) by hand (and sometimes hammer). so feel lucky.
then again, after i re-read... were they really welded or "rust welded" ?