Clear lacquer can keep brass nice for a long time. It may be a little trickier to spray lacquer on shiny metal than on wood. Little uh-ohs jump out at you.
This may sound nutty, but wax can also be used. When I had a guy restore some antique light sconces, he added a couple of little new switches. He dipped those in gun bluing to make an aged color and then used Howard's Feed 'n Wax over all of the brass, old and new. I was skeptical, but this was about 10 years ago, and they look exactly the same.
Phil Nelson
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