I have painted new dried plaster with a watered down matt base paint a couple of weeks after I painted the wall with Wickes matt paint. When it dried out there was rough patches/pitt marks. Any ideas why? I have tried a different paint and roller, but the problem is still there. I rubbed down the rough parts and as the paint shop told me to put a 10% watered down matt paint on over the top, but the problem is still there. I have tried another room wall and I am still having the same problem. It's not orange peel affect, which you can get if the paint isn't watered down enough and it not indented into the wall like you get if the plaster isn't dry.
Thank you.