I carry my Kel-Tec PF9 in a JS Armory leather pocket holster. The holster is produced with the unfinished leather side outward for better grip within the pocket. Arizona sweat has obviously permeated the leather straight through and caused a bit of rusting on the slide where it contacts it. Will oiling the leather holster help to create a moisture barrier within the leather? If so, would Neatsfoot Oil do the trick?