Hi, I live in an old terraced house and recently spotted a rising water stain on an interior adjoining wall. I applied three coats of Screwfix No Nonsense Stain Sealer, allowing plenty of drying time inbetween applications, followed by two coats of Dulux emulson. A few days later the paint started to crack.I have tackled stains like this in the past but have never known the paint to crack? Any suggestions? Thanks.