I painted one of the cheap (like $50) 4MP Chinese import Dahua turrets once. It was white to start with. Like the amateur painter that I am, I didn't use any sandpaper, primer, or anything. Just a can of spraypaint and a bit of masking tape for the lens, IR, and microphone hole. Did two or three layers in a short amount of time, didn't let it dry more than about an hour, then put the camera up. Of course, the mount did scratch the paint off a little, but I don't care. It served its purpose of slightly camouflaging the camera.