one trick that works when you come across a frozen nut or bolt is to never keep pushing the limit until the head breaks. playing chicken with frozen bolts is a real headache. if you encounter a frozen bolt hit it with lots of liquid wrench then apply a torque in both the positive and negative direction this works more effectively than just applying a 'loosening' force. this also works if you have a screw somewhere at home that has been painted over.
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