Frame Paint Repair Around Brake Ferrule Lugs

I've got a 2000 Bianchi aluminum frame which had some bubbling
paint/corrosion in and around the brake ferrule lugs (on top tube).
I've sanded the paint and corrosion off the lugs. Now, I'm wondering
what to do next. Should I take to a bike repair shop and have it
touch-up painted or is it possible to do a decent job with some touchup
paint and maybe a spray gun. I have an air compressor and am fairly
mechanically inclined. I've heard aluminum is not particularly fond of
paint, is there a primer I need to use or can I just scuff up surface
with medium sandpaper?