When I was in industry, the machinists used Kroil penetrating aerosol too. I keep a can in the shop for the really tough jobs since it's pricey......but it works.........
On stubborn bolts/nuts, I always use impact, intensity set per the size of the fastener. One thing that somebody said and works is to try to screw the fastener in tighter a bit then go for the backing out. Other thing is back and forth, back and forth, etc., till it starts to turn. If you can get it out far enough to get some thread showing, get some Kroil on the exposed thread and run the bolt back in the hole then back out a couple of times to get some PO on more of the threads.
Last use heat to break the structure of the oxidized iron.
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