I have just put up new jointed plaster board walls and painted with B & Q matt white emulsion as a base coat. Unfortunately I did not water down the paint. Where ever I have painted with the brush eg corners above/below coving and coving the paint has crazed (and is spliting on the coving). I have painted 3 coates waited a day in between each coat. The paint is also cracking where I have gone over my brush painting with the roller down the sides of the corners. Could you advise why this has happened and how I can now rectify this mess as I have many more walls to paint and would hate for them all to go this way