I just purchased some DuraBlue blue/black. The can comes with the hardener inside the paint can. This paint can be sprayed on all types of surfaces. I was going to use it on a Colt 32 but after waxing the gun I decided not to. Ren wax does wonders.
Maybe I will use it to improve the finish on my new Taurus 92 that the finish isn't very appealing. I twould sure look better with a deep blued look on it.