Recently while decorating the kitchen we developed some bubbling of the paint work on a newly plastered wall. There were patched of white powered coming from the bubbles. I called in a damp proof company who advised to hack off the plaster and render back to the brick work and they will inject it. This has now been done, but whats the best way to render the wall to protect against the damp/white powder coming back again before its replastered.
thx
thx