Undercoat for bathroom walls where there was mould

[torqueofthedevil]

Due to poor ventilation / condensation in a shower room (extract now fitted) some mould formed on walls / that’s all been removed but it’s left some slight staining. Don’t really think it’s necessary but wanted to put an undercoat on top of the existing paint before the new top coat.

Don’t need a really thick mould specific stain locker but just some general thinnish stain block. Any suggestions?

Saw somebody recommend Zinsser BIN somewhere else which I think is a great product but overkill for something like this.

[Belle427]

Maybe something like this would be suitable to make sure the mould is killed.
https://gkproductsuk.com/products/gk-pro-fungicida...

[guywilko]

Wood undercoat used on walls was advised by our insurers after a fire to stop stains appearing

Has worked well. Aware mould is a living thing rather than a chemical.

[Slagathore]

I don't think BIN is recommended if you check the guide on the Zinsser website for painting over mould.

123 or 123+ will do the job.

or the new BIN Aqua might work as well.

But if you're happy the mould is 100% dead and have bleached etc, I'd imagine any stain blocker would do the job.

[Wings]

White vinegar kills mould. brush it on to the mould then leave for two hours before brushing off, and washing down wih soapy water. Mould grows on cold damp surfaces. so ensure surface is totally dry, before adding decorative paint. Since mould grows on cold surfaces, I use a warm to touch undercoat paint Suretherm Anti Mould Insulating Glass Bubble Thermal Paint, and then a trade matt emulsion paint.