Most hardware and paint stores sell primers especially for galv. steel and
aluminum. Just clean threshold with 409 or Fantastic, very lightly sand
with 220 sandpaper or fine steel wool, wipe dry, and prime on a warm day,
but out of the sun. Any exterior finish canned paint can be used to cover
the primer. Or, you could mask off the primed area, then use a spray can of
preferred color, as this is a tiny area to cover, and won't drip, since it
is horizontal..

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We ordered some doors for our house. We specified dark bronze hinges
and threshold. They arrived at the job and were installed before we
were able to check them. They arrived with silver aluminum or
stainless thresholds and brass hinges. I contacted the door mfg and
they can send me the bronze hinges to subsitute. However, since they
are installed, the thresholds can't be changed without removing the
doors and trim. Can I paint the thresholds and, if so, what kind of
paint will stick to the aluminum?