So... these can look pretty cool when they are done right, I guess. Unfortuantely, they are damn near impossible to do so. Do yourself and a friend a service. Make a blood oath. If either of you mentions the possiblity of getting one of these done that person gets slapped. Repeatedly.
What's the issue? Take a look at some of these images. They are an interesting finish, but it just happens to destroy the barrels they are adhered to. "But that that 'dunk' process seems so clean!" I hear people say. Too bad applying a decal while submerged in fluid just traps everything right against the metals. So... what do you get? Rusty Crap™.