Oh, I hope you don't write-off RL paints altogether! I have painted two rooms with his paint and have wonderful experiences. One was a very dark tent green, and the other was a sky blue. Did you use the matching primer coat? Even without, four coats seems ridiculous. Was it mixed or bought outright? It could be that HD messed up the paint. I just don't understand why it was so bad for you. At any rate, I hope your walls are better and that you give RL another try.