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Hi all I need to know what is the best weather sealant for penetrating damp to put on an outside wall. My builder recommended dulux weathershield with johnson weatherproof on top. But there are so many 'amazing' products on the market and I want to find the best one. Any recommandations?

We have a very difficult wall with numerous damp issues. Threre numerous brown and grey wet spots showing in the house and paint and plaster gets cracked in places. There is also water dripping out of door frame and a window frame where water has gone into the cavity. It's a cavity wall and...