Anything you carry a gun in frequently will show "wear" on it eventually. With that said, the guns that I carry in Kydex do seem to have more wear marks on them and faster than the guns that I've only carried in leather (talking guns with similar finishes ).

"Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same." - Ronald Reagan