I've repainted the master bedroom with a B&Q "colours" matt paint, which is
OK apart from half-way down one wall. The paint there has cracked, almost
like a dried river bed, and no amount of coats has cured the problem. I've
sanded each coat down, and also tried adding pva into the paint but each
coat dries cracked.
Does anyone know what it wrong? The cracking only appears at dado-rail
height and below on one wall.
Assuming that you have painted over the plaster, this problem can be caused
by old wallpaper adhesive. To confirm this you would need to remove the
emulsion from a small test area then wash the plaster with sugar soap, then
re-paint to see if the problem recurs. If old adhesive is the problem the
easiest fix is probably to paper the wall, e.g., with an embossed paper,
then paint. Otherwise it is removal of the emulsion over the affected area,
wash down to remove the old adhesive, then re-paint. Obviously, if that
section of wall has never been papered then old adhesive is not the cause of
the cracking paint.
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