Supco MO44 Rust Buster Liquid Penetrating Oil

Good penetrating oil.

Bought this because of frozen prop shaft stuff box and within less than a hour I was able to easily break apart the the nut from the shaft housing. I give it an A+

Did not work.

But rust buster you could ever invest in.

This is the best by far. Hard to find. Amazon prime!

I had two rusty hinges on a ramp for a trailer. I Used this on both. One hinge came loose in a matter of 15 minutes. The other hinge required several applications more and finally heat and a mallet to loosen the 2nd hinge. I was kinda impressed with the first hinge loosening up so quickly.