Check in weapons section for more info but I would equip a Damage Up for sure. Aerosprayer is a 4 hit kill and if someone happens to have a Defense up main or 3 sub abilities it just turned your 4 hit kill into a 5 hit kill.
It also depends on your play-style but if you are thinking of what will directly help the weapon...
-Ink saver main or recovery
-Ink saver sub (only RG if planning to use ink mine in Tower)
-Ninja Squid (you will need to get majority of your kills from sneaking up or assists).
-Damage up
Stay away and reroll any special loading/saving abilities. Helpful but with Aerosprayer you will fill up that gauge pretty fast regardless and if you are skilled then you wont die enough (and you honestly shouldn't) to make them worth it. I also wouldn't really invest in defense up, sure it might help you against other damage up players but honestly if you are getting out ranged, aren't watching your back, etc, you are gonna get splat anyway.