damascus is usually made from different carbon steels forge welded together. carbon steel rusts so it would need to be sealed (covered). the general rule of thumb when finishing a cue is to not put finish on a steel joint. i believe this is because the finish does not adhere to the steel as well.
there is something called timascus not sure what is in it other than titanium. high dollar stuff.
try looking into mokume since it is made with more common cue joint metals.