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interior walls showing outline of cavity blocks

Posted: Wed Apr 08, 2009 2:15 pm
by bibien
Can anyone advise me about the sudden appearance of the outline of cavity blocks on my interior lounge walls. The outlines look like shadows on the walls and are dusty grey.

I want to redecorate and do not know what to do to ensure this problem does not happen again.

Advise would be very much appreciated.

Regards

Bibien