I've tried the freeze spray, both on it's own and alternating it with heat from a MAAP torch. I found it totally ineffective.
Kroil or Acetone/ATF mix are your two best bets for penetrant, as others here have suggested.
I've also found that impact forces can help, but don't go overboard. Light taps on the bolt heads with a hammer will produce shock waves that can help the penetrant do it's thing. An impact driver can also be effective, but only of its a relatively weak one, like the battery powered ones. (Where's a sonic screwdriver when you need it! ) The pneumatic ones are powerfull enough to twist the head right off unless they have an adjustable force setting. In any case, just use short bursts, and if they don't produce any movement, use heat and more soak time.
Patience and time are the key here to a successful outcome. Good luck.
Kroil or Acetone/ATF mix are your two best bets for penetrant, as others here have suggested.
I've also found that impact forces can help, but don't go overboard. Light taps on the bolt heads with a hammer will produce shock waves that can help the penetrant do it's thing. An impact driver can also be effective, but only of its a relatively weak one, like the battery powered ones. (Where's a sonic screwdriver when you need it! ) The pneumatic ones are powerfull enough to twist the head right off unless they have an adjustable force setting. In any case, just use short bursts, and if they don't produce any movement, use heat and more soak time.
Patience and time are the key here to a successful outcome. Good luck.
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