<p>Treetop, if you really think it’s the paint color, we’ve done the sample cans, to test how color looks and varies over the day, in light and dark parts of a room. (But, I think they are usually satin, not flat, so you have to account for that difference.) Otherwise, we usually primed first, when going lighter over dark colors. Sometimes, a 2nd top coat also does the trick, depending on how much you care about whatever room. I have had rooms where a 2nd wasn’t needed, especially with BM. But again, that depends on what you’re dealing with and how you do it.</p>