I also insulated my Roof AC box two years ago.
IMO painting the cover is NO LONGER need if you insulated the box.
The reason is when I checked my AC unit last year in full afternoon sun the Black cover was hot to the touch but the insulated part under the cover was cool to the touch.
But I guess it could not hurt to paint it white - esp if you like that look or if your black cover looks old.
I like the black color of mine and I use 303 on my roof / vent / AC covers 2x a year so they look like new. 
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2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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