We have a large damp patch on our pale painted plastered wall which was caused by a radiator leaking from the room above.This happened nearly two years ago so has dried out but left a stain from the radiator water.We have painted over it many times with emulsion,first seven coats of white and then the pale wall coloured paint but the stain still shows through. This is above the window so not a plasterboard wall.Would sanding it out be the only answer.
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