Just realized that Rust-Oleum flat black MUST be well mixed. I had simply been shaking the can for 1-2min thinking that this would mix the "flat" into the black well enough. WRONG - What you get doing it this way is varying forms of semi-gloss and not the flat black black we all want. After stirring vigorously and adding some thinner (lacquer thinner) I am now getting the expected "flat" black. Wanted to pass along this bit of info so someone can dodge having this problem.