Never prime or paint damp roughcast. Apply stabilising primer to the roughcast using a roller. ... Allow the stabilising primer to dry for two hours. Scrape loose gravel, sand and pebbles from the roughcast surface using a wire brush.

Is painting roughcast a good idea?

Unfortunately, with such a rough, bumpy surface, pebbledash isn't really suitable for painting. The various peaks, troughs and sharp edges are a nightmare to paint – and the results are rarely good. On top of that, paint is never a long-term solution outside your home.

Can pebbledash be painted?

Yes, luckily you can paint over pebbledash! Having said this, it is known as one of the most difficult exterior surfaces to paint, so it is important to properly research this before undertaking to ensure you get the finish you are looking for.