i used automotive paint and clear coat on my box. I prepped and and painted just like you would a car. If the box is fiberglass i would recommend using some flex additive in your paint to help prevent cracking.
na f uckin once its sprayed, when it gets hot as i do live in florida fumes start to react to heat, no? when it gets like 90* 100*(degrees) will that shit **** up the surround. lol i would never try and paint with my woofers in there.