A couple of my guys run a time saver stroke sander which puts a grained finish on the doors and frames we build/sell....

We build out of Bronze, Brass, Stainless, ect.....

A #6 Satin finish requires a final hit with 180 grit.

We always have to be more careful with the brass, and the bronze, than with anything else because it heats up quickly and hold the heat longer. Sanding too much too fast will burn the finish and cause cause warpage.

Pretty hard to BS me on most thingsmetal.............