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Solid slate walls

This is two weeks after painting. Not home for a while, so no pics of outside. I think I'm going to have to get the outside wall rendered, as the rainfall in north Wales is higher than national average.

Hi Freddie, yes. Just can't find out how it's getting in. Tried sealant, waterproofing around outside of window, repointed even, but can't find or stop ingress.

Hello Freddie, I've used, Zinnser, then tried Dulux water blocker, then three coats of oil based undercoat. Each time, about two weeks later blisters appear. I've left adequate time between coats. Can't find where the water is getting in, hense need something extreme to block it coming through...

Thank you Freddie, yes I'll may have to try that. Can't find where it's getting in. If anyone knows anything hardcore that I can paint on, please suggest.

Hello, I have applied numerous anti damp paints to internal window reveal. Two weeks later bubbles appear in the emulsion applied on top. There is water coming in from outside. Can't find source. Is there anything to paint on inside wall to stop blisters?