Cheers John S, a great read.
I've also been wondering about that blue wonder for some time, no way i'd put it on a luger, but i sure would like to try it on a clapped out shooter, or one of my demill resto jobs. I came close to trying it a few months back, but at the time, where i was, could only find the gun blacking kits, and not the blue, so gave it a miss!