[cctalk] painting computer cases

I must have asked numerous times on numerous forums how this is done. Did you ever take a close look at the paint on a 5150 or 5170 (or hell even any IBM monitors that are age appropriate, but those aren't metal). Did you notive the wormy, orange pealy finish. I don't think anyone has seriously attempted to explain how to accomplish that. It's not simply a sligjtly gritty texture as in the case of modern atx cases, that can be done with a spray can, sort of. Do they simply cause the spray gun to spit on the final coat, perhaps while the previous coat is still tacky?