Hi @Will_M,

While not "recommended" I would think that any plastic safe, non-metallic, acrylic type paint would fine.  Probably safer to brush it on (rather than spray).  Keep it thin and don't get any inside of the AP.

A fabric cover with elastic would also be fine, though probably not ideal for non-residential applications.

You could probably remove the outer, top plastic cover, and then spray the exterior, that way.

Get a cheap 225 ($59 on Amazon) and test it before and after.  See if it makes any difference.

Given that the RF signal goes through walls, paint, drywall, etc.  I don't see any real concerns.

-Jonathan

@Will_M 

Just to say, not sure of your application, but these work best ceiling mounted.  Against a white ceiling, they are fairly attractive.

-Jonathan