[R-390] Knob painting question

[Scott, Barry (Clyde B)]

I am in the (slow) process of refurbishing a couple of sets of knobs.  I
have cleaned the old paint off and smoothed the surfaces with #320 and #400
wet-or-dry paper and figured they were pretty much ready for powder coating.

In the process of restoring some brass and other parts for my "new" Zenith
T.O., I was using a cotton buffing wheel with jeweler's rouge as the
polishing paste.  I wondered what this would do to the aluminum knobs so I
gave it a shot.  Wow!  The surface really polishes up nicely.  I thought
about giving them a coat of lacquer and letting them stay bright, but it
gives them a "dime-store stereo knob" kind of look so I nixed that.

My question is will buffing them prior to powder-coating be a bad thing?  In
other words, will the coating be less likely to stick to the shinier
surface?  If it will stick, then I think the polished surfaces will result
in a much nicer looking knob.  Anyone tried this?

73,

Barry(III) - N4BUQ