Hi all, I had a DPC done about 3 weeks ago in all downstairs rooms after I moved in a house that smelled badly of damp and had tidal waves on the walls. The guys that did the job removed the old plaster, down to the brickwork and told me the old plaster that was there wasn't right (wrong mix or something) and so they did the DPC, replastered (with the right mix) and skimmed the wall. It's been finished to a high standard and I'm happy with the results. The smell has now gone, which is great. They told me to not decorate for 6 months because although the DPC would start working immediately, the moisture needs to get out of the walls and the paint/wallpaper wouldn't stick and it would invalidate my 30-year warranty. That's fair enough. What I have noticed though is that on some walls (admittedly on very small areas) there is a little bit of white fluff on the plaster. Is this efflorescence (i.e. bad) or is it a sign that the brick is drying out (i.e good). To be honest you have to look very closely to notice the white fluff, I have brushed it off and monitoring to see if it comes back. So I'd like your opinion on whether this is anything to worry about. Thanks!