I have an aluminum
made by Markey that they powder coated. Much of the paint
blistered up within the first year. Don't bother powder coating aluminum
and feel fortunate if you can get any paint
, including properly applied Awlgrip to stick to aluminum for any great length of time. If rust never sleeps then aluminum oxide is its hyperactive relative.
My philosophy with painting aluminum is if you absolutely don't have to paint it then leave it bare. Aluminum oxide is a wonderful protectant so long as it is not constantly moist..setting it up for electrolysis