@BigBen2K
I was considering that, but if I re-sand and shoot it with more paint, I'd be more apt to use an opaque color instead of clear. I want the copper to be the primary source of sheen and reflection, not the paint.
Don't people do that with waterblocks all the time?
Maybe the brasso is leaving a "protective" film on the metal, and I need to wipe the surface down with something like alchohol or acetone or Tarnex before painting it...
Maybe enamel would be better since this is just duct and not a waterblock...
@logosmani
Hmmmm, I don't know what kind of lacquer I bought. With my luck, nobody locally carries it...