Painting over stained plaster

15 Aug 2016
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United Kingdom
Hello -

After some advice from more knowledgeable heads!

Fresh plaster skim on kitchen ceiling. Leak in bathroom during pressure test of new heating system. Also a few yellow stains coming through on plaster (previous leaks?).
Leak now sorted, but can't afford reskim again. Ceiling dried out now.

My question is - I've gotten cover stain primer - should I put this directly on the plaster? Or do a watered down emulsion first, same as everywhere else and then the cover stain primer?

Just hoping the stains don't come through on my freshly painted kitchen ceiling...
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Thin the Coverstain a bit then straight on. A coat of emulsion first wont do any good at all. It will kill the stains, as will Zinsser 123 BIN and oil based undercoat.
We have just refurbished our house and had exactly the same problem as you, fortunately I have successfully dealt with stains like this before ( another story! )
The best way I have found ( having tried all sorts of propriety stain blocks ) is to give the stains a coat of oil based undercoat, let it dry overnight and then paint as normal.
Only once have I had to give a stain two coats , and that was when the stain was dark brown.


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