Wall bleeding/staining

Question

How does bleeding/staining occur on a wall? Why is this happening what can I do about it?

Radu · Accepted Answer

Stain block as a temporary cure(a few good years), assuming there's no condensation or water leaking that may be pointing to other issues. You may want to find the cause to find the treatment. Also, it may be from plastering work as it may be too old, the previous leaking that infiltrated the rendering.

Mike · Answer

Usually due to water ingress if area is dry use a stain block allow to dry properly and then paint over may need a couple of coats

Stuart · Answer

It’s caused by water or moisture bleeding through the paint. The first job is to stop the 
Water from coming through! Wait till fully dry and then treat with an oil-based stain blocker like Zinsser stain block. It’s available in a spray can or regular paint on with a brush.

David · Answer

Hi, use PVA bonding  before you paint the wall will stop all bleeding marks from coming through

Michal · Answer

It is caused by moisture. First you have to locate the source of that and fix it (ie. deep cracks, broken dpc, dripping pipework), when that is done you can use stain block first and repaint the area.

Stephen George · Answer

It is probably some sort of damp from either a previous leak or condensation issue you can cover it with an oil based paint until not visible and then finish it with a couple of coats of emulsion and that will sort it

Terry · Answer

The most likely result would be moisture getting in . If it’s by a window try resealing the window or it could be maybe some repointing needs doing

Matt · Answer

If it’s yellow/brown then that’s water 
If it’s a dry wall then maybe there’s a slight dripping coming from a pipe/hose from inside. 
Once located and fixed let the wall dry then paint with oil-based paint then put your topcoat over that.

Peter · Answer

Hi,

Sorry for the late response. It could have a lot of origins we raise a lot of questions to discover where the problem comes from.

Including soot stains, house dust stains, pet or animal stains, and thermal tracking or thermal bridging stains associated with building air leaks, and building insulation defects.

Regards,
Peter

Russ · Answer

You have to buy a stain blocker it comes in paint or spray, put it on wait till dry then paint over it.

Wall bleeding/staining

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