Most powder coat paints are cured between 350-450F, and that is within the temperature range that will affect the temper of heat-treated aluminum alloys. Icon billet control arms are machined from 6061 alloy, and some 6061 hardening processes are performed at temperatures as low as 320F, so I would NOT have them powder-coated. Wet paint would be fine.
I'd contact Icon and get their input, but as far as I can tell Icon does not offer powder-coated billet control arms.
I'd contact Icon and get their input, but as far as I can tell Icon does not offer powder-coated billet control arms.