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Damp Stained Plaster

Postby Newbie623 » Wed Dec 16, 2009 9:50 pm

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.

Many thanks for any help
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Postby rosebery » Thu Dec 17, 2009 11:53 am

All you are doing is rewetting the stain every time you paint and its leeching through. Go over it with a specialist stain block or oil based undercoat first then your ordinary paint.

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