Two thoughts
Hi Stuart
Acetone and Automatic Transmission Fluid mixed 50/50 and 24hrs time, I've tried all of the commercial penetrating solutions and have not found that works any better. Squirt all the bolts both ends, you plan to undo with this solution, then let them sit over night or even squirt them again and let them stand longer. Have had amazing results.
Next trick is vibration, using a punch in my air chisel and the air pressure turned down to like 20 PSI vibrate the bolt and nut. If you can hit them straight on and then the nut in particular from the side. You don't want to deform the bolt or nut you just want to vibrate the rust in the threads.
Cheers Phil
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