It's very easy to paint, just use a water based exterior latex. Or buy UVR PVC, if you can find it. But really, the UV damage done to PVC is limited to the outer most layer, it will discolor/darken, and become less impact resistant, but it doesn't affect it's pressure capacity. I have unprotected PVC going on year 7+ in my yard/garden irrigation, still works great. Some is still white, some off white now, one pipe is discolored almost purple/black. Just watched DS drive over the darkest pipe in his little 4 wheeler the other day, no damage to the pipe.After thought: PVC is not UV stabilized. It needs to be protected from sunlight. It can be painted, or especially good is to use the foam pipe wrap which will help keep the water temp stabilized. I considered using a foil wrap, but then read that rodents and some birds are attracted to the shine... Anyone have experience with that?
I don't have experience with foil wrap but I do have experience with chickens... as far as the foam pipe wrap is concerned, they will tear it up. So, having water pipes exposed but still protected is something to think about. Perhaps you would have to build a "box" of sorts around the pipe to protect its insulation?