As I say in my catalog, the only way to totally prevent bluing wear on a gun is...never put it in a holster! As was posted by yahoody, the act of drawing and holstering a gun causes the wear. There is no way completely around it; only ways to minimize wear. For one thing, depending on the holster design, the gun must contact the inside of the holster at seven places. Otherwise it will flop around in the holster, causing more wear! The best, and only lining I use is topgrain cowhide, smooth side to the gun. Suedes and buckskin will accelerate wear for the reasons stated; they pick up dirt and powder residue. John Bianchi, in his book "Blue Steel and Gun Leather" states this, as well. When asked why, then, did/does he make suede-lined holsters, he answered that was what some customers demanded!