Updated on 26 June 2026 · by Pepe, painter in Elche
It's one of the things people tell me most: "I painted it myself and two weeks later the ring was back again". I'm Pepe, a painter in Elche on the Costa Blanca, and I'll explain why it keeps coming back and how to tackle it properly, no messing about.
Why it keeps coming back
There are two reasons, and they nearly always go together:
- The cause wasn't treated: if the damp is still getting in (a leak, condensation, rising damp), the stain comes back every time.
- Ordinary paint was used: a standard emulsion doesn't block the ring; the yellow bleeds through because the stain has salts and residues that 'stain' the fresh paint from underneath.
How to fix it properly
To stop it coming back you need to do two things: cut off the source and seal the stain.
- Make sure the cause is sorted (the leak repaired or the condensation under control).
- Cut back anything blistered or flaking and leave the area dry.
- Apply a stain-blocking primer (solvent-based or a dedicated one): this is the coat that blocks the ring for good.
- Finish with the topcoat (breathable, and anti-mould if the area needs it).
The step almost everyone skips
The classic DIY mistake is going straight to the colour paint without the blocking primer. That middle coat is the key: without it, no matter how many coats you put on, the stain always ends up showing through. That's why a job done by a professional with the right product lasts and the home 'patch-up' doesn't.
If you want it sorted once and for all, I'll take a look and tell you what's going on with your wall and what it needs (see my damp and anti-mould service). If the source is a burst pipe or something structural, I'll tell you straight so it gets fixed first; painting over live damp never lasts.
Want the exact price for your project?
I will come and see it with no obligation and give you a fixed quote, free and the same day. You deal directly with me, no middlemen.
FAQ
- Why does the stain come back for me but not for a professional?
- It's down to the blocking primer and treating the cause. Ordinary paint doesn't block the ring; with a stain-blocking primer and the damp under control, the stain won't bleed through again.
- Will any primer do?
- No: you need a stain-blocking primer, made to seal damp rings and nicotine. A standard bonding primer won't block the stain.
- And if the damp is still getting in?
- Then you have to sort the source first (the leak, the condensation or the rising damp). Painting over live damp never lasts; I'll tell you honestly what can be painted now and what needs fixing first.