I just refinished two SS Garand gas cylinders with it. I used the dark gray intended to match manganese parkerizing. It works incredibly well. I bead blasted the surfaces. I used the recommended two passes. It's MEK carrier evaporates so fast it doesn't run easily. MEK on a swab removes overspray before it has been baked. Once baked, as Scortch says, it is difficult to remove.
Not that if your passes are two light, it dries so fast it creates a rough texture that will show up in the final work. I recommend you get a couple of steel scraps to try your technique on first.
Nick