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Kroil rusted the metal.

This is a discussion on Kroil rusted the metal. within the Maintenance forums, part of the Firearm Forum category; When I was younger I worked on old cars for a hobby. I'm talking about years like 1929, 1933, 1947, 1949, and 1956. Rust was ...


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Old November 4th, 2009, 06:07 PM   #1
 
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Kroil rusted the metal.

When I was younger I worked on old cars for a hobby. I'm talking about years like 1929, 1933, 1947, 1949, and 1956. Rust was the devil to fight. I read an article about Kroil and decided to order a gallon plus a spray can. It does creep down in places you want it to go and I think it is a good product. I wanted to get a small pump sprayer to use with the gallon can. I found one somewhere that was heavy plastic and had a nice bendable neck to move as needed. Just an oil squirter for rusted bolts. For some reason the Kroil and this oil squirter did not do well and the sprayer would not work after it sat for a while. I bought another one and it also died without ever being able to use it. I really don't have a problem with the chemical reaction messing up the sprayer, hay this stuff is strong. The other surprise was that a part of the inside of the sprayer was metal. It was pump that must have had a piston inside to force the liquid out. Guess what, the metal part rusted. Yes, dark rusty grit and falls off when touched. Submerged in Kroil it rusted. Just surprised me this would ever happen.



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Old November 5th, 2009, 02:17 AM   #2
 
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I use Kroil as a way to loosen copper in my rifle's barrel.
Kroil is a very good product. As advertised Kroil will disolve rust.
As a rust preventative there are better products.
Kroil did not cause the rust on the parts you have issues with.
I would suggest you go to Kroil's website and learn more about the product.
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Old November 5th, 2009, 04:48 AM   #3
 
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I have never had Kroil react that way on any metal I've used it with. If I have heavy leading in a barrel (from shooting a lot of soft HBWC's) I soak the inside of the barrel with Kroil and let it sit overnight. Then I use a Lewis Lead Remover and with one swipe all the lead is gone. It seems to get under the leading and loosen it up. I've never had anything but good results any time I used it. I even use it when tapping and threading (if I don't have have my normal cutting oil handy).
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Old November 5th, 2009, 07:09 AM   #4
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Confusing, isn’t it. Rust is a very common form of corrosion but it is not the only form. What happened to your sprayers was most likely corrosion of the metal in the form of leaching that broke down the metal components by chemical reactions with some of the materials in the alloy.

This is very common in non stainless steel alloys and can happen in many stainless alloys as well. Steel alloys contain several metals and non metal components and if any of the components of a metal react with other chemicals, the metal breaks down. The bottom line here is that I agree with Hairtrigger. I sincerely doubt that the Kroil “rusted” the metal of the sprayers; I would bet that the Kroil caused a breakdown of the plastic components to some level that formed chemicals corrosive to whatever metals were there. Spray bottles normally are not made from the best plastics and the metals used inside are not the more corrosion resistant alloys.

Be concerned if you see any “rust” or corrosion inside the factory container. Next time you are in your LGS check out the oiler bottles with the thin tubular dispensing tips. These are made out of polypropylene with stainless steel needle tips and are great for storing and dispensing oils, solvents and liquid based synthetic lubricants. They can’t spray but they certainly allow you to apply the material in concentrated areas. If you squeeze the bottle a little aggressively (not too hard) you can get it to shoot a stream of liquid.
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Old November 5th, 2009, 09:38 AM   #5
 
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Not just everywhere do you have access to gunsmiths and engineers.
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Old November 5th, 2009, 05:51 PM   #6
 
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I agree it was a chemical reaction. The piston in the pump swelled pretty soon and locked it up. So I decided to just let it stay in the container. When I later saw the rust I was really surprised. On a handgun, it is great to put just a drop under a drift sight. I had one on a Browning and it was in the vice and I had used a punch and hammer with no progress. Kroil visited and the drifting began. On bare metal, it is not what you want to prevent rust. I've tested it and I would not advise.
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Old April 24th, 2010, 05:25 AM   #7
 
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To follow up on this past experience I will share my latest surprise. I bought a generic squirt bottle at Harbor Freight for my Kroil that came in a metal gallon can. It has a plastic bottle and "brass looking" metal for the tip and inner tube. It happened again, the inner tube is gummed up and the Kroil will not flow. I will contact the company this time. Frustrating and funny at the same time.
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Old April 24th, 2010, 05:55 AM   #8
 
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I have run tests with bare metal and left them on the roof for a while with different products applied to them to prevent rust. Kroil did not do well in these tests. WD-40 did very good, even the new formulation. However, WD-40 isn't even in the same catagory as Kroil for a penetrant and for loosening rust and stuck parts.
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Old April 24th, 2010, 11:04 AM   #9
 
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I use Aerokroil and Hoppe's 9 as a solvent and CLP/Rem oil/WD 40 for everything else..................................
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Old April 24th, 2010, 11:37 AM   #10
 
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Interesting

I have read that WD40 is for displacing water, not lubrication.
Years of personal use with Kroil in barrels has led me to believe it will not cause rust.
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Old April 24th, 2010, 02:26 PM   #11
 
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All:__________
Here's the manufacturer's link for Kroil: KanoLabs.com.
Kroil is a rust penetrating oil for loosening of corroded parts. That is why it works so well at loosening fouling and why lots of rifle guys (...me included...) like it. It is a penetrant; not a lubricant. I suspect is is very closely akin to a highly refined kerosene; but i dont know for sure. In my working days; we used this stuff by the gallon to help remove some humongous fasteners in some very igh dollar machinery. Kroil is good stuff.

Hope this helps,
Leroy
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Old April 24th, 2010, 03:53 PM   #12
 
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Quote:
Originally Posted by leroy View Post
All:__________
Here's the manufacturer's link for Kroil: KanoLabs.com.
Kroil is a rust penetrating oil for loosening of corroded parts. That is why it works so well at loosening fouling and why lots of rifle guys (...me included...) like it. It is a penetrant; not a lubricant. I suspect is is very closely akin to a highly refined kerosene; but i dont know for sure. In my working days; we used this stuff by the gallon to help remove some humongous fasteners in some very igh dollar machinery. Kroil is good stuff.

Hope this helps,
Leroy
Yes it is.

AreoKroil is the same thing except it's more exspensive because it's marketed to Aviation! LoL!.........................................
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Old April 24th, 2010, 04:22 PM   #13
 
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I thought it was called AeroKroil because it came in an aerosol can.
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Old May 24th, 2010, 08:40 PM   #14
 
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Keep WD-40 away from firearms. It gums up when it dries and is a mess to try to remove.
As a gunsmith, I have cursed more guns that had dried up WD-40 than I can count.
As for the Kroil, I love the stuff, but do not use it as an anti rust preseritive.
That is not what it is made for. I have never seen it cause rust, it is so thin that it most likely evaporates in time.
Use it to get screws and bolt loose and to clean bores, then use a good gun oil afterwards.

Best regards, John K
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