DAMP PROOF PAINT: -is a specially formulated coating for damp interior wall surfaces. This paint can be left as a finish in its own right or as a damp-proofing primer sealer prior to overpainting with a Johnstone's decorative finish. Damp Proof Paint incorporates a water-reactive agent which takes care of residual surface moisture, but this does not remove the need to repair any structural faults which allow water to penetrate in to the fabric of the wall. Please download the manufacturer's data sheet for full details.