Short answerAn anti-condensation paint helps when the damp is condensation: vapour from the home itself settling on a cold wall. It's breathable, lets water vapour escape from the wall instead of trapping it and helps reduce the surface conditions that encourage condensation. It doesn't remove vapour from the air, doesn't stop water rising from the ground and doesn't seal a leak.
If your stain is condensation, anti-condensation paint plus daily ventilation. If it's something else, cause first. Then the finish.
"Anti-condensation" is one of the most repeated labels on paint shelves and one of the least well explained. Some sell it as if it could dry out any wall and others say it's useless. Neither is true. In this guide we explain what it really does, when it's worth it, when it isn't and how to apply it so it works properly.
What condensation is and why paint has a say
The air in a home always carries water vapour: we produce it by breathing, showering, cooking or drying clothes indoors. When that air touches a surface colder than its dew point, the vapour turns to liquid right there. With air at 20 °C and 70% relative humidity, the dew point is around 14 °C: any corner, column or outside wall at that temperature or below gets wet.
That film of water is what feeds mould in high corners, behind wardrobes and around windows. So condensation has two fronts: the air (how much vapour there is and how often it's renewed) and the surface (how the wall behaves when the vapour reaches it). Paint can only act on the second. It matters, but it isn't everything.
What an anti-condensation paint does
We'll use as a reference the two paints in our range designed for this, with what their technical data sheets say:
- It's breathable. The film doesn't seal the wall: it lets water vapour escape from the wall instead of trapping it. An ordinary plastic paint forms a closed layer that water sits on.
- It changes how the surface behaves. Pared Seca and MATE5000 AntiHumedad contain Quartzene® + Graphene/CaCO₃® Technology, based on mineral materials and aerogel, which changes the thermal behaviour of the paint film, helping reduce the surface conditions that encourage condensation and improving thermal comfort.
- It stands up to everyday life. Very good washability, high hiding power, no yellowing and excellent flexibility: it won't crack.
Put simply: on a wall with condensation, a paint like this stops being part of the problem. Plastic paint makes things worse because it traps moisture; anti-condensation paint lets it out.
Pared Seca
Breathable, damp-resistant and anti-condensation. It lets water vapour out of the surface instead of trapping it.2 L DoyPack · 12 colours · 10–12 m²/L per coat
What it doesn't do (and nobody should promise you)
- It doesn't remove vapour from the air. If the bedroom is at 80% relative humidity every night, the wall will feel it. You need to ventilate and sometimes dehumidify.
- It isn't insulation. It doesn't replace wall insulation or fix a thermal bridge. If an area condenses every day despite ventilation, that's building work and a technician should assess it.
- It doesn't stop damp rising from the ground. If there's salt bloom and a dark band low down on the wall, that's rising damp. An anti-salt treatment goes first; we explain it in salt bloom on walls.
- It doesn't seal a leak. If the stain grows when it rains, water is getting in from outside. Painting inside before stopping that is throwing money away. See what to do about water ingress.
- It doesn't kill mould. Mould is cleaned off before painting. If the wall has a history of fungi, it's cleaned and prepared with Sellador Total L44, which regulates absorption and improves adhesion of the finish.
How to tell if yours is condensation
Before buying anything, check that the problem is condensation. These signs point to it:
- Steamed-up windows in the morning, especially in bedrooms.
- Scattered black spots in high corners, where the wall meets the ceiling or behind furniture against an outside wall.
- It gets worse in autumn and winter and improves in summer.
- The stain has no clear tide mark and doesn't grow after rain.
If you see white powder low down on the wall or a tide mark that grows with rain, it isn't condensation. The guide how to tell what kind of damp you have helps you tell the difference, and if you'd rather we looked at it, send us a photo.
Pared Seca or MATE5000: which to choose
| Pared Seca | MATE5000 AntiHumedad | |
|---|---|---|
| Use | Indoors and sheltered outdoor areas | Indoors only |
| Size and price | 2 L DoyPack · €23.90 | 4 L · €19.02 / 15 L · €65.79 |
| Coverage | 10–12 m²/L per coat (around 6 m²/L in two coats) | 5–7 m²/L per coat |
| Finish | Matt | Deep matt |
| Colours | 12 from our chart | 12 from our chart |
Choose Pared Seca for one room or a bathroom: the 2 L DoyPack covers around 12 m² in two coats and also works in sheltered outdoor areas. Choose MATE5000 if you're painting a large interior area or want a deeper matt; the 15 L tin works out better for a whole home. Both cost the same in every colour. On-screen colours may vary from the real thing.
How to apply it step by step
- Reduce the condensation you can before painting. Ventilate the room for a few days so the wall is dry when you start.
- Clean off the mould. With a product made for dark stains, following its label. Let it dry thoroughly. There's more detail in how to remove mould from a wall.
- Prepare the surface. It must be dry, sound and clean. Remove any poorly bonded paint. On well-bonded existing paint no primer is needed; on new work, the Pared Seca data sheet says to apply Sellador Total L44 as the first coat. It can also be applied over textured (gotelé) walls.
- If there was mould, Sellador Total L44. Diluted 1:1 with water as a primer. Second coat or finish after 24 h.
- Paint in 2 or 3 even coats. Between +5 °C and +40 °C, out of direct sunlight. Start with the edges, spread the paint by rolling several times without overloading the roller and don't go back over areas that are drying. Too much product per coat can cause micro-cracking.
- Respect the drying times. With Pared Seca, second coat after 2–4 h (at 23 °C and 50% humidity); with more humidity or lower temperatures, wait longer. Fully dry in 24 h.
- Keep ventilating. Ten minutes of cross-ventilation in the morning, and keep furniture a few centimetres away from outside walls.
How much you need: a real example
A 3 × 3 m bedroom with a 2.5 m ceiling. Walls: 12 m perimeter × 2.5 m = 30 m². Deduct door and window (about 3 m²) and you're left with 27 m².
- With Pared Seca (around 6 m²/L in two coats): 27 ÷ 6 = 4.5 L. Three 2 L DoyPacks, €71.70.
- With MATE5000 (5–7 m²/L per coat, two coats): between 7.7 and 10.8 L. Three 4 L tins (€57.06) or one 15 L tin (€65.79) if you're also painting the ceiling.
If you're only treating the wall that condenses, just measure that wall. To fine-tune, use the calculator or the guide how much paint do I need. If you choose MATE5000 and the wall had mould, the Condensation Kit combines Sellador Total L44 750 ml and MATE5000 4 L for €26.69, 6% less than buying them separately.
What really makes the difference
Anti-condensation paint works best as part of a package: less vapour (extractor in the bathroom and kitchen, no drying clothes indoors), more air exchange (short, daily cross-ventilation) and a surface that doesn't trap moisture. A cheap hygrometer tells you if it's working: the aim is to stay between 40 and 60% relative humidity. If, with all that, an area still gets wet every night, the problem is thermal and calls for building work. We explain it layer by layer in condensation at home and on the condensation solution page.
Guía escrita y revisada por el Equipo Humix Paint con los datos de las fichas técnicas de cada producto. La pintura actúa en la superficie: si el agua sube del suelo o entra de fuera, primero se trata la causa.
