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The procedure with regards to rising damp or water ingress causing salts to appear is to -
Dry It (if possible and if not then resolve the water ingress)
Scrub it with a stiff Non Ferol Brush
Wash it with Distilled Water (no Chlorinated/minimum minerals)
Wash it with Muriatic Acid (more salt = stronger mix)
Wash it with Amonia (to neutralise acid)
Wash it with Distilled Water
Seal it....here l am struggling with what to seal it with?
I thought of an an alkali sealer or a salt resistant sealer (Permaguard or Dupont rtc) but these are designed for salt pool areas and are waterproof. This isn't suitable as l want to paint the surface.
Also l want to stop any water coming back through the sealer but allow vapour as, if there is any residual damp, l don't want it to osmose causing more salt crystals to appear on the surface.
Then again, if it is impermeable, l am worried about the salt crystals forming under the plaster in the air pores of the masonry.
I also want to prime the surface before any acrylic emulsion finish as a final barrier and thinking an anti-alkali primer might work?
Finally, if l do take the gypsum plaster off (salt water is notorious for damage to gypsum due to extrapolotion of the mineral salts) then l want to re-render then skim with anti salt cement render and finishing skim.
Is there any ready mix sealers, primers, cement render and plaster finishing products suitable as l don't have access to sharp sand. I can buy additives for the cement and sand but, as l say, sharp sand isn't available in my market.
I not sure if l can add anti salt additive to jointing plaster fot a top coat?
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Not a good idea to hijack an 8 year old thread. Here's a shiny new one just for you.
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any salted surface or surface showing damp has to be hacked off back to brickwork or stone and rendered with a 3:1 or 4:1 mix of sand and lime.use any old sand.
stay away from all those chemicals and never seal with chemicals or anything else.
emulsion is not a barrier its a water based decoration.
could you show photos of both sides of the wall or walls?