Tried the Cassey stuff. Bought a bottle at Gander Mtn. First results sucked - too light, and not even at all.  The instructions on the bottle give lousy results.  So, I went on the web and watched some videos.

Second try, I rebuffed the part. Heated it in a toaster over to very warm.  Hot enough to not want to hold it in my hand, but not hot enough to actually cause burns.  Then I slathered the stuff on, instead of dabbing with a patch.  Really slopped it all over for a couple of minutes, keeping it wet as the heat tried to dry it.  At this point it looked like hell, being all streaky and rusty looking.  I let it sit for a minute or two, then buffed it out using steel wool.

Much darker, but still blue, and nowhere near black like some finishes.  Still a bit uneven, which means I need to try it again.  Color isn't all that important, but it has to be even and uniform all over.  Water beads up on the surface. I'll lightly sand it and try again.