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Hi Thanks for the above replies and please forgive me for my late reply – computer troubles! All of the replies offered sound advice especially the posts by JohnD and KenGMac. Woody and mrrusty – good logic. Thanks all, will report back as to how successful I have been. Barry

Hi, I'm having problems with a damp patch on an interior wall. The bricks on the exterior of the wall have a white crystalline deposit on them. I have been recommended to treat the external wall with Thompson's water sealant. Should I try and remove the white deposit before I coat with the...