Dealing with after effects of condensation on wall

[gsr121]

I have a property which has had a small condensation issue, please see picture.

Just wondering what is the best way to deal with this prior to repainting the wall, so that (a) mould doesn't reoccur (*), and (b) staining doesn't come through . Someone mentioned some kind of PVA paste before painting over it.

(* appreciate that living habits will also need to change to prevent reoccurrence.)

The wall is dry as property has been empty for a while.

Thanks
G.

[ClaphamGT3]

What was in the corner when the problem occurred, what is the room used for, what age is the property and have you recently done anything to change the ventilation of the room (ie fitted replacement windows)?

[gsr121]

There was a wardrobe. Property was rented out and had two people occupying the bedroom.

Double glazed, no trickle vents, but had the ability to lock windows partially open for ventiliatiom. However, I suspect they poorly ventilated it.

G.

[mcdonaa]

Clean down to remove as much of the staining, give a quick sand to key up and remove loose paint, then use Bullseye 1-2-3 primer and stain killer. You may need two coats. Then paint over as normal. Worked really well for me with an identical problem to yours.

http://www.decoratingwarehouse.co.uk/buy/paints--c...

[gsr121]

Thanks, I'll get my hands on some of that.

Do I need to do the whole wall with the primer, as will you be able to see a different paint tone for the treated area underneath the top coats I put on afterwards?

[Alucidnation]

Neat bleach has always worked for me and paints over no problem once dry.

[wolfracesonic]

Adding to mcdonaa's post you might be as well using this over the BIN 123 Perma white It's likely the mould will return at some point and this stuff is supposed to resist it better than most. It can be tinted if you want a colour other than white.

[gsr121]

Thanks for the advice. Have got some bullseye 123 from Screwfix. Will give the affected area a good clean first, probably with specialist mould killing cleaning product, then let dry overnight.

Wall is magnolia so I'll see if there is some perma paint close to that colour.

Should I do prime the whole wall with the bullseye, it just affected area and immediate surrounding area?

Thanks
G.

[Mr GrimNasty]

I know lack of air movement is the main cause, but it may be worth investigating why that corner is prone - if it's a cavity wall I'd suspect insulation inconsistency or rubble in the cavity (it doesn't always transmit damp, but does make the inner wall colder).

[mcdonaa]

Just paint a few inches around the mould...no need to do the whole wall.

Oh, and yes...you will need a few coats of magnolia over it to cover the white primer.

[V8RX7]

Best stuff to remove mould / mildew is chlorine - if you don't have a pool, use Milton.

Smells nice too.

[Blue Oval84]

For the cleaning stage you need HG Mould Spray from B&Q, don't bother with anything else.

I used it on my white emulsion wall which had was covered in thick, black, furry mould. Within half an hour it was all gone and I didn't even need to repaint.

[gsr121]

Just some feedback on this and to say thanks for the advice.

I used the bullseye 123 and it has done the job perfectly.

G.

[bazza white]

Blue Oval84 said:

For the cleaning stage you need HG Mould Spray from B&Q, don't bother with anything else.

I used it on my white emulsion wall which had was covered in thick, black, furry mould. Within half an hour it was all gone and I didn't even need to repaint.

We used this in the shower room when we bought the house. We stripped the paint off sprayed heavy areas and wiped a diluted solution over the rest of the plaster. Pretty amazed at the job it did. Looked like freshly plastered walls after a few hours.