How to prevent penetrating wall stains

Question

How can I stop wall stains from bleeding through a painted surface? What can I do about this?

Tim · Accepted Answer

The best product to use on wall stains is "zinsser B-I-N primer" not cheap but quality product. Jus paint the primer over stained area. Thanks
Tim
Site Contract Services Ltd

James · Answer

Zinsser is the best option but can also use egg shell  might take few coats but will stop the bleeding

Stephen · Answer

Everyone has "The answer".
Mine is to use a high quality eggshell paint.
A couple of coats covers and copes with most stains/bleeding and can cope in a hostile environment like swimming pools, showers etc

Radek · Answer

Zinsser Cover Stain 

You can get from B&Q, Screwix, etc

Sam · Answer

Use a good quality stain block spray or paint or you can even cover with gloss and that will stop bleeding especially if it is red pen.

Dale · Answer

Use Zinsser shellac. Apply with a medium pile roller. Ensure the finish is smooth.
Don't hang about, this will start to dry within minutes, especially if the room is warm. Keep the area well ventialted.
Stir the tin thoroughly and stir every few minutes of use.

Terry · Answer

First you need to stop the leak or moisture getting in . Sand the effected area abs apply a stain block . One dry you can then paint over the new surface

David · Answer

If you put PVA water proofer from wickes on the wall best taking all the paint off the wall first with sand paper and apply the PVA so it stop the damp coming through and gets a good bonding to the wall wate till it’s completely dry before you apply the paint.

hope this helps
Dave

Paul · Answer

Find out we’re the moisture is getting in . Normally throug the seals on your windows or maybe an old leak. Treat it, stain block it, and repaint

Tamoor · Answer

It is called efflorescence and you need to use salt neutraliser to cure the problem, also have the wall injected with damp treatment at least 6 inch in the wall to get deep result.

How to prevent penetrating wall stains

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