by Abus » 25 Mar 2008 20:33
Although wildly extravagant, I have hot tanked a couple of lock tools in with other parts, which certainly gives a *really* nice bluing. But on the cold blue route:
I've always liked to heat parts up, not necessarilly really hot, but say, 250 degrees or so after degreasing with brake cleaner, then apply the bluing solution (Birchwood Casey or Brownells) with a piece of paper towel or scotchbrite pad held in hemostats while the part is still pretty warm. Scotchbrite works nice on parts that are resistant, since you can really scrub the stuff in.