Repairing paint after efflorescence

[cwhaley]

The chimney breast in my kitchen has efflorescence and bubbling paint in the lower quarter. This is because the open/uncapped flue was un-vented at the bottom which meant sitting moisture.

I have since installed a 9" hit and miss vent to promote ventilation from bottom to top.

Does anybody know the best approach to repairing the painted wall? My guess is to carefully scrape away the salts and bubbled plaster, sand down, fill and pits/holes and then paint over with emulsion and top coat? Not sure if this is right. I also only have around a pint of the original paint left which is a chosen colour from the Dulux MixLab.

 

[ic1927]

Sand down/scrape off the salts and then apply a coat of alkali resisting primer, allow to dry fully and then do your filling, sand, spot prime filler with thinned emulsion, and you're ready to go with the finishing emulsion coats.

 

[opps]

I second the alkali resistant primer.

Zinsser Watertite will also work but will be far more expensive.

http://www.zinsseruk.com/howto/how-to-paint-over-efflorescence/

 

[cwhaley]

Thanks for the advice - this type of primer was totally off my radar so I will have a look in the DIY sheds at the weekend as I'm out there. Seems expensive for the isolated place I have this problem but worth it in the long run.

 

[opps]

https://www.tradepaintdirect.co.uk/dulux-trade-alkali-resisting-primer.html

£14.80 for 1L

You local Dulux Decorator Centre should have it in stock for £21

https://www.duluxdecoratorcentre.co...uct/paint/specialist-paints/primers/?count=50

Or £21 for 2.5L of Leyland

https://www.glenwooddecoratingsuppl...trade-alkali-resisting-wall-primer-white-p328

I would be surprised if any of the DIY sheds sell it.

 

[cwhaley]

Trouble is with online places, they sting you on delivery. That first one comes in at £25 once you add delivery and VAT.

I'll try a local DIY store but if not, go to the Dulux Decorator Centre as there is one local and £21 on the way back from work isn't too bad.

Thanks for the links.

 

[opps]

Sorry, I hadn't realised that Tradepaintdirect show the prices ex VAT , my bad.

Additionally, I hadn't factored in the delivery costs.

At that kind of price I would be more inclined to ask my local Leyland paint decorator's merchant to order in a tin of 2.5l. I tend to stick to Dulux Trade but I am not convinced that in this case it is worth the premium price.

Thanks for the feedback though, sometimes I just link to the first site that I find and clearly fail to interrogate the total cost of ownership.

 

[ic1927]

If your local B&Q has a tradepoint, a lot do now, then you can get 2.5 litre tins of Leyland trade alkali resisting primer there, I've seen it in our local B&Q, can't recall the price though sorry.