Home DIY

I'm not an expert when it comes to painting but since the decorator I used to sub out work to has retired I have been badly let down by everyone else I've got in to do the work so have had to take it on myself. Based on recommendations from @Airhead (who knows much more about painting and decorating than myself) I've started using Zinsser paint and would need a very good reason to change now. All of their products that I've used go on easily and allow you to get a really good finish with little effort (no messing about slacking paint off etc). I've been so impressed that I've almost enjoyed doing painting work (in the past I've turned into a bear with a sore head every time ive had to pick up a paintbrush).

Zinsser make 2 products that look like they would do the job:

Perma-white an interior grade paint that has fungicidal properties (it can also be tinted so colour matched). I've used this recently on a bathroom renovation where there had previously been problems with water leaks and poor ventilation (an extractor fan that hadn't worked for at least 5 years) it went on easily, covered up residual stains from the mould well after treatment.

Watertite a mould and mildew proof water proof paint for basements. I've not used this but given how good their other products are have no reason to doubt it won't be good. Their website recommends it for basements etc. (your photo looks like a basement - if it's not I would recommend that you identify and address the source of the damp before painting anything)

Edit also what grumpy git says re removal and treatment. If there are kids/pets about t-tree oil diluted in water and sprayed on the wall works well in my experience.

Finding out why they are mouldy will be useful too - otherwise it will just come back, no matter what chemicals you throw at it.