. WD40, liquid wrench, PB and ZEP all have a lubricant in them (Kroil does not, hence some non-believers) that is good for getting latches and rotating or sliding mechanisms to work again.
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That's not exactly true. The original Aero Kroil has no lubricant and it straight penetrating oil, but they also sell another version, Sili- Kroil that has a silicone based lubricant in it. I usually keep both on hand depending on the use.
As far as only being available mail order, I've found that most commercial HVAC supply houses carry Kroil on the shelf ( although you pay a premium when dealing with those places )
It is by far the best out there. Only beef I've ever had with them is I wish they would just go back to the smaller spray cans. The large cans last so stinking long ( because it takes so little of the stuff to do the job ) that the propellant ends up leaking out in this heat before all the stuff gets out of teh can, but I figured a workaround , I just take a refrigerant can side tap and puncture the can at the bottom and drain it into a pump spray container ( otherwise I just buy the bulk liquid when ordering direct and skip that )
As far as p blaster, the only thing I have ever found it effective at separating is money from my wallet I find the initials P and B strangely close to the *PlaceBo effect*
theres a lot of products out there that folks shoot on and a few minutes later they go after it with a bit of extra grit in their gut and give credit to the goose grease. Unfortunately for me with the kind of crippling arthritis that I have, that kind of extra oomph just isn't in the cards, ,I have to rely on a penatrating oil that actually does the job all by itself without any extra arm and hand input from me, because I simply do not have it anymore like I did when I was a young fella ( yes, I too remember those days of walking away and then coming back and going apeman on a stuck fastner... but that was before my favourite chair had wheels on it
), and Kroil is the only thing that hasnt let me down consistantly. In a jam CRC freeze off has worked on some that had minor rust buildup and weren't too tight, but it wound't get the real heavy stuff, that required waiting on the kroil .
First time I was introduced to Kroil, I had gone looking for my screw type ball joint press and found it sitting in a full bucket of water ( where it had been for about 2 years
clamped down with 6 feet of pipe hanging off the ratchet ( and after soaking with industrial penetrationg oil from local supply house that was usually pretty worthless ) wouldnt budge it, and my neighbor who had an ice machine service saw me fighting this and came over and gave me a can and shot it down and told me to try it in the morning. First thing it popped right loose without a fuss been sold on it ever since and it's never ceased to amaze me.