I have decided that painting though fun, is not worth the time. I've concluded that atomizers are disposable. I still wanted to decorate them though a bit and also for the purpose of telling the new ones apart from the old ones.
I went to Sally Beauty Supply and bought some acrylic nail decorations. These are tiny decals and rhinestones. After I stick them on the e-cig, I coat the decal and go slightly beyond the edge of the decal with a special topcoat called "For Rhinestones Only". This will make the decal or rhinestone permanent and only takes less than a minute to do this (far less time than my paint job). I tried to add a photo to this post, but was not successful. I don't know what I'm doing wrong.
Anyway, if you want to dress up your e-cigs a bit, this is a good and easy way.