If it's not a warranty issue and heading back to SIG, I suggest you get some Jasco Metal Prep (or etch). It's a dilute phosphoric acid that will convert the rust, even in the pit is the metal, to iron phosphate. Follow directions, rinse with water, spray with WD-40 or similar to displace water, and wipe down with your favorite lube.
And don't do that again.
On my holsters, summertime, hot etc, I use some wet suit material between me and the gun. It's threaded through the belt loops with the holster to keep it in place. Adds comfort, no sweat.
No, that's the reason for the dilute phosphoric acid, it converts the rust (ferrous oxide) to iron phosphate which is inert, even in deep pits. Rust won't come back with normal maintenance. SS is quite resistant to rust in any case, mostly due to it's chrome content which, when exposed to oxygen forms a thin layer of chromium oxide. It's this thin protective layer that helps prevent further oxidation. But as shown, when subjected to really adverse conditions such as salt water and corrosive chemicals, it can still rust.Doesn't the rust always keep coming back? I would think this needs to be refinished. Might be for the better as the PVD is horrible. A nice cerakoted legion could be the way to go.
Rust expands, and with a lot of force when contained as it sometimes does with rebar in concrete (this is mostly limited due to a lack of oxygen). So yes, it can look like it's growing on a surface. It can also "bleed" and discolor a larger area when it is coming from just a pin ***** size hole. An worse, if that pin ***** size hole is in a surface finish, the rusted area can grow beneath the surface coat - - though usually if this is the case it will lift the surface coat until it too cracks, as when paint blisters over rusty steel.If you look close it's on the safety lever too. It's almost like something growing on it vs it coming from under the finish.
He/She dropped the photo and left us all to guess ... I guess :lol:
Berry Intewesting.....It is only a couple months old, wasn't stored and has not been carried. It's has seen an OWB holster during range practice and steel matches but never against bare skin. There is no reason it should be rusting. I take great care of my guns. I also run them quite wet and wipe down everything in oil. SIG is getting a call tomorrow, this finish is ridiculous. I'd rather have Cerakote than their PVD junk.