If I have an 1860, 1866, a couple brass TG/BS revolvers, and I (in dry Arizona) am starting to see corrosion on the brass, is there a way to "seal" the metal? I can clean it up with 0000 steel wool, but I vaguely remember people saying that the brass frames from uberti/Taylors/cimarron are not true brass frame, but they seal the metal with some type of dyed metallurgy? Idk, but I'm curious if "a thin coat of gun oil" isn't doing the trick, is there something to get that 'factory level protection' on the brass again?