Anything you put on top of the SV-GPS-250 will affect it's ability to receive, whether paint, a canopy, or something else. Practically speaking, the SV-GPS-250 can find satellites even indoors sometimes (in hangars and such), and so you may be able to get away with painting it without there being any discernible effect. On the other hand, you may strike out. So we don't recommend it for best performance and can't guarantee performance or warrant a painted SV-GPS-250.