By small areas I mean not entire walls. I'm pulling my kitchen apart and
when I pulled the tiles off some of the plaster came off (a couple of
areas of about 1.5m squared each. Now the concrete below these is a
little crumbly so someone at work told me to get some pva, dilute it and
then paint it on first before putting the plaster on. I did this in a
small area yesterday but am not convinced it's the best thing to do as
the plaster I put on still shows damp patches presumably as the moisture
is not soaking into the walls. Have I done this wrong? I don't want to
cause more damage...

Advice please?
--
John