Best bolt loosen spray?


Asked by May 21, 2013 at 03:56 PM

Question type: Maintenance & Repair

Best bolt loosen spray?

1 Answer


From Machinist's Workshop magazine. -- They tested penetrants for break- out torque on rusted nuts, with interesting results, especially how we've come to rely on PB Blaster... They arranged a subjective test of popular penetrants, with the control being the torque required to remove the nut from an equivalent "scientifically rusted" environment: Penetrating oil / Average load to break free -- None / 516 pounds -- WD-40 / 238 pounds -- PB Blaster / 214 pounds -- Liquid Wrench / 127 pounds -- Kano Kroil / 106 pounds -- (50/50) ATF-Acetone mix / 53 pounds --- The Automatic Transmission fluid- Acetone mix was a "home brew" of 50/ 50 automatic transmission fluid and acetone. Note the "home brew" was better than any commercial product in this one particular test. A local machinist group mixed up a batch and all now use it with equally good results! Note also that "Liquid Wrench" is nearly as good as "Kroil" for about 20% of the price. ---

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