When we moved into our house last year there was a problem with some damp on the lower floor. We called in the damp proofing people but we had real trouble with one interior wall in the hallway. The damp guys came back 3 times to try and fix the issue, with the final result being that the damp was eradicated but the hallway wall was left a total mess. Most of the wall had been drilled away numerous times to inject anti-damp treatment and even though I used a range of plaster repair tools and fillers, when the wall got a new coat of paint it still looked shoddy. What made it worse was that this wall was by the back door so the light shined on it all day highlighting all its imperfections..