In the O'Reilly book "Raspberry Pi Hacks" there is Hack 40 "Make Your Pi Water-Resistant (Without a Case)" in which they describe how they make a Raspberry Pi temporarily water-resistant using Rustoleum's NeverWet paint.
Then I got my hands on a (not so limited?) matte-black Pimoroni Pibow Midnight case. But as can be seen on this image the green PCB of the Raspberry Pi shines through. So I wondered how it might look like if I'd paint the Raspberry Pi in matte-black, too.
Hence my question is: Is it safe to paint the Raspberry Pi in a different color and if so, is there (preferably matte-black) color/varnish/coating which is (preferably explicitly) non-conductive and could be used to give a Raspberry Pi PCB and its chips a different color?
So far I only found this thread on the web but most replies seem to be about wrapping stuff in tape to hide the PCB. Another web page touches the topic, but only lists material, no actual product or so.
Side questions: Anyone did something like this already? Any side effects on the cooling?