Good afternoon, What is the best thing for sealing yellowish damp stains on a plaster ceiling before applying emulsion? Is an oil-based undercoat ok? Thanks
sealing damp-stained ceiling before redecoration
Nov 28, 2008
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If its damp you fix the leak and wait till its dry, any oil or shellac product should block the stain
Ronseal do a "Stain Block" spray which is dry enough in 10 minutes to apply paint over.
HTH -
IME thats usually good enough, but not every time. But then thats true of more spcialised stain blockers too. if you get a blocking failed situation you just have to sandwich paint layers.
NT
thanks will go with u/coat
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