IMO Nitron is a pretty tough finish. There are lot of reports on sigforum where people carry their Sig daily in and out of kindex holster with no finish degradation.
When it "dries" (It'll become gray-ish) just put a few drops of oil on a rag and wipe it: it'll look like new (deep black)!
just had a thought (rare as that is)... if you're nervous about scratches when putting it down on a table either at home or at the range, carry a rubber mat, like the kind used to line tool drawers. heck, go to the dollar store and scope out the various placemats and find something you'd be comfortable shelling a dollar or two for to put your thousand-dollar gun on.
i got those foamy rubber types, 2-pack for a dollar, the type that look like a mesh.



























