If the damp wall is in a bathroom, you can turn on the exhaust vent fan to remove humidity and discharge it outside the home. SK: What’s the best type of paint to use to help seal in the moisture?

Damp painted surfaces can also be susceptible to peeling and chipping — especially if walls aren't properly prepped and maintained. When deciding which bathroom paint to buy, there are several ...

So if moisture is a problem, musty air caused by moisture, Damp Rid is the product to use. Now Zinsser makes a product called Mold Killing Primer.

Kris DeVos, owner of Fox's Painting and Decorating, recommends using a product called B-I-N shellac-based primer-sealer by Zinsser, which costs £22.99 for a one-litre can on Screwfix.