Hi all, My wife and I have been trying for days to paint a wall with chalkboard paint and it's proving to be a really frustrating affair. The first 2 coats went on fine enough with a roller, but then we notice lap marks so we got a wide foam brush and tried that and it made things so much worse. Then I tried a roller again and it improved a little, but it's still markedly worse than the 2nd coat, which was imperfect. I'm a little worried that I'm putting too many coats on, but I don't see what other choice we have - the lap marks are really noticeable because this wall is right against a floor-to-ceiling window so the marks are really visible from the side. However, when looking head-on it's not that terribly noticeable. I'd be grateful for any tips/suggestions on how to fix this once and for all please. Thank you!