Can Stormdry be applied to damp walls? How long to I have to wait to apply Stormdry after it has rained?

To allow optimal penetration, Stormdry water-repellent cream should be applied to dry walls.

As a guide at least 24 hours should be left before application of Stormdry after a period of heavy rain (longer during cold periods – i.e. ambient temperature below 15°C). After short periods of light rain leave at least 2 hours before applying Stormdry (longer during cold periods).