HDDs are airtight and manufactured in clean rooms. If there is an air hole in one, it does not touch the platters, which means that it would be impossible to get spraypaint on the platters. It clogs the filter, which means air can no longer go in/out of the HD. I'm not trying to flame i am just thinking out loud. I'm just saying that a large layer of paint isnt necessarily...well good for your computer. Paint insulates heat...you just have to be careful how much you use.