On Friday, April 27, 2012 1:08:21 PM UTC+1, NT wrote:

PS all emulsions let water vapour through, and can be put on before a
new wall is fully dry.

Are you sure about this? All books I've read on the topic as well as some online sources (say, http://www.diydoctor.org.uk/projects...newplaster.htm, for example) say only to do this with special paint such as Wickes New Plaster Emulsion or Dulux Supermatt.