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RE: Efflorescence - salt crystals on the walls...
Oh dear, it does look quite bad there isn’t it? Interesting that the salt migrates to the surface. I would brush off the salt too and paint it over. But dampness might bring it back though?
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That's right, @marblely. I'll wait for a few weeks and it will hopefully dry enough to paint over at some point, but as @gillianpearce says it will need 'sealing' with something like PVA...