Here's the second vote for TORQ CB corrosion blasting penitrating oil from kimball-midwest. Untill trying this stuff i called all spray lubes "horse ****" and would go for the torch before using any of them. This stuff actuaaly does work, if sprayed on rust it will fizz and bubble as it brakes up the corrosion and gets into the joint. Its expensive and probably deadly, but it does work very well for freeing heat sensitive parts or in places its tough to get a torch into without burning somthing. Steve D