DIY question

HAL9000

A couple of years back we had a roof leak (due to the lead flashing between the chimney and the roof tiles being defective). This was all repaired but did leave a damp patch on an interior wall whch forms part of the flue/chimney. Although this has long since dried out the paint is discoloured where the damp was, and painting over the area seems to be only a temporary solution - in a short while the new paint will also discolour and darken. My understanding is that this is a common problem where there has been damp and that sealers are available that can be painted over the previously damp area before repainting and that this should fix the problem. Only thing is I’m not sure what I actually need to ask for. I assume this sealer has some name.

Any help much appreciated.

i don’t want to redecorate the whole hallway/landing area if I don’t have to. The amount that needs sorting is actually fairly small. Also, the paint was painted over a textured wallpaper and I’d rather not have to repaper.

HerrMetal

Stain block primer. Zinsser is good

randella

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Jimbro66

Something like this should do the trick if the area is just stained and not still damp

https://www.toolstation.com/zinsser-cover-stain-primer-paint/p56164?store=S8&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&gclid=CjwKCAjw7anqBRALEiwAgvGgm3bzXMOsVmgxDHw43_OF8qi8sA2jBVFTtimUc788rzcA1-OjAkVDChoC-UUQAvD_BwE

randella

Opps, mispost!

Sorry.  As you were.

Iamnobody

You can get a spray one. I’ve used it before it works. Polycell one coat stain stop.

I’ve also used a paint on one not much in it for me and the spray is easier.

boogieman

It’s normally called stain block. Screwfix sell their own No Nonsense brand, which works ok but needs a couple of coats. They also do Zinsser which is better but more pricey. 

HAL9000

Thanks for all the replies. Off to get some Zinsser.