There are two areas in our kitchen where the paint just flakes and falls off, both on interior walls. I tried rubbing down and repainting a couple of years ago, but the same thing happened very quickly. The kitchen is semi basement. We're thinking about repainting the whole room ourselves soon; I just saw that Dulux Easycare Kitchen Matt is recommended, but I'm not sure this will solve the problem. Should we put some kind of sealant on first? TIA for any suggestions.