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Brown Stains Bleeding Through New Paint
You have painted a wall or ceiling and a brown, yellow or grey mark has come back through the fresh coat.
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What's happening?
This is bleed-through. Something soluble in the surface beneath is dissolving into the wet paint and rising to the top as it dries, so the mark reappears through every coat you apply. Water-based emulsion is the worst carrier for it, because water re-dissolves exactly the contaminants that caused the original mark. The common culprits are old water staining from a leak that has since been fixed, tannin from knots and unsealed softwood, nicotine and soot on a ceiling, rust from a fixing, and felt-tip or crayon on a child's bedroom wall. Adding more coats never works — each new coat gives the stain fresh solvent to travel in. The stain has to be sealed under a barrier the mark cannot dissolve through.
What usually causes it?
- An old water stain from a leak that has been repaired but never sealed before decorating
- Tannin bleeding out of knots or bare softwood into the paint above
- Nicotine and tar deposits on ceilings and walls in a house where somebody smoked
- Soot or smoke residue after a chimney or a cooking fire
- Rust from a nail head, screw or fixing corroding under the plaster surface
- Marker pen, crayon or biro on the wall, which dissolves into water-based emulsion
- Efflorescence — soluble salts drawn to the surface out of new or damp masonry
Is it dangerous?
The mark itself is harmless. What matters is whether the source is still active: a stain that grows, darkens or feels cool and damp to the back of your hand is a live water path, not an old scar, and that needs the leak found before anything is painted. A stain confined to its original outline that has stopped changing is historic and only needs sealing.
Can I fix it myself?
Yes, if the source is dead. Wash the area — sugar soap for nicotine, which removes most of the deposit before you seal anything — let it dry, then apply a stain-blocking primer over the whole affected area rather than just the mark, and recoat. Solvent-based or shellac-based stain blockers hold back tannin, nicotine and water stains that a water-based primer cannot. One thing that never works: more coats of the same emulsion.
When should you call a painter and decorator?
Call a painter and decorator when the stain has come back through a stain block, when it covers a whole ceiling, when the source is nicotine across a full house, or when you cannot tell whether the mark is old or live. A decorator will confirm the substrate is dry, choose the right blocking primer for that specific contaminant, and get an even finish across the sealed and unsealed areas.
What will the painter and decorator actually do?
- Check the stain with a moisture meter to establish whether the source is live or historic
- Wash down nicotine, soot or grease deposits before any sealing coat goes on
- Apply a stain-blocking primer suited to the contaminant, over the whole surface where the stain is widespread
- Spot-prime knots and rusting fixings, punching and filling fixings where they sit proud
- Recoat the full wall or ceiling so the sealed area does not flash against the rest
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