Well, I've posted on a similar thread (
http://www.texasshooting.com/TexasCHL_F ... 6&p=201260 ) regarding
Microlon Gun Juice and its great properties. I've not used it primarily as a rust inhibitor (one of its selling points) until now, but I will say that the guns I've treated with it (including my primary carry) have not shown a hint of rust since they were treated. My Mosin-Nagant 91/30 tended to take on surface rust in the barrel and outside of the receiver if not kept oiled every couple of weeks. I scrubbed the bore and cleaned (with hoppe's #9, windex, and CLP) until it came out absolutely clean with all of the cleaners, then treated the gun with Microlon. In the months since then, it has not shown any signs of rust, and is much easier to clean.
Recently, I decided to try the Gun Juice as a rust preventer. My extra carry mags have been accumulating rust on the faces that ride above the mag carrier against my shirt, as well as on the whole exterior of my BUG mag (which either rides in a pocket or the weak-side compartment of my 5.11 holster shirt under my armpit), so I thought I would de-rust them using 0000 steel wool and
Blue Wonder Gun Cleaner (which worked wonderfully, BTW). Once they were free of rust, I wiped them dry and treated the outside surfaces with Gun Juice - apply a coat, heat with a hair dryer for 20-30 seconds until dry, repeat 7-10 times (20 is recommended for stainless, BTW). Previous to this, I had de-rusted the mags and simply oiled them up, and the rust would return within about 2-3 days. It has been about a week so far, and the rust has not returned.
I also had problems with rust on my BUG (an LCP) when carried in the holster shirt while doing outdoor work - there is a thread about it here:
http://www.texasshooting.com/TexasCHL_F ... 7&p=182461 . Since I was treating the mags already, I went ahead and did the same for the LCP, which had the same rust problems return after a couple of months, particularly on exposed exterior face of the barrel/chamber. I treated the entire gun in the same manner as the magazines. So far, I have not seen the rust return here, either. Additionally, the finish on both the mags and the gun is better, and is somewhat slick (but not wet, as it's a permanent dry lubricant).
I will report back after a while longer and let everyone know how it is holding up, but given my experience with the 91/30, I expect the results to be unchanged.
If you decide to try this out, do not be surprised at the appearance of the finish while treating your gun/mags/whatever. While the treatment is being applied, it's going to look ugly. The reason is that the Gun Juice acts as a solvent/suspension, getting all of the crud out of the metal as it is going on. This will result in what looks similar to an oil slick on a puddle as the stuff dries. Once you finish the treatment, all of this stuff will simply wipe away, and you will have a uniform finish underneath. I've found that the stuff actually
improved the appearance of the finish on my guns, probably because it has removed all of the junk from it, and all that is left is the metal and the bluing (or parkerizing or whatever your finish happens to be). The actual surface texture of the finish (matte blue, shiny blue, polished aluminum, parkerizing, etc.) has remained unchanged in all of the guns I have treated so far.
