10-26-2016 12:32 AM
If you want to paint an AP-225, you will very likely want to use the AP-225-CVR-20 AP Cover (note the product code is a box of 20 of those covers; have seen people order a box per AP ;-). That is a snap-on cover that can be painted and will not void your warranty.
On the back of that cover is says: >PC/ABS< which indicates to me that it is made of Polycarbonate ABS.
Check this Airheads topic for an image and some more info (on the 215 cover, different product, but same approach).
Install guide for the cover, including some drawings, can be found on the support website.
If you have urgent issues, please contact your Aruba partner or Aruba TAC.