Interiors need coatings that tolerate the movement caused by swinging between fierce air conditioning and outside humidity. Kitchens and bathrooms need genuinely moisture-resistant systems, not standard emulsion. Exteriors need elastomeric or high-build coatings with real UV stability — ordinary masonry paint chalks and fades within a Dubai year. In all three cases, preparation determines the result more than the product does.
Preparation is the job
Filling, sanding, stabilising and priming takes far longer than applying the finish coats, and it is the first thing cut when a price is driven down.
A premium paint applied over unprepared plaster will flash, show every defect under raking light, and peel within a couple of years. A mid-range paint over properly prepared substrate will not.
Wet areas
Kitchens, bathrooms and utility rooms need moisture-resistant systems with fungicidal properties. Standard emulsion in a bathroom will show mould at the ceiling junction within a year or two, particularly where extract is inadequate.
This is a specification decision that costs very little and is frequently overlooked.
Exteriors
UV is the enemy. Ordinary masonry paint chalks, fades and loses film integrity quickly on south and west elevations. Elastomeric and high-build coatings with genuine UV stability last considerably longer and bridge hairline cracking in render.
The substrate matters as much as the coating. Painting over hollow, delaminated or cracked render simply means the new coating fails with the render.
Timing
Fresh plaster and screed need to dry before being sealed. Painting over green plaster to hit a handover date traps moisture and guarantees a failure later.
This is one of the most common reasons a newly finished project starts showing problems in its first year.
What the climate does to paint
Three things. Ultraviolet exposure degrades binders and fades pigments far faster than in a temperate climate. Thermal cycling moves the substrate daily, which finds any weakness in adhesion. And humidity, particularly coastal humidity, keeps surfaces damp long enough for mould to establish on anything that supports it.
A system specified for a European exterior is not specified for this. It will look acceptable for a year and then fail in a way that cannot be patched.
Interior systems
For most internal walls a good quality emulsion over properly prepared and sealed substrate is entirely adequate. Where it matters is wet areas and anywhere with poor ventilation, where an anti-mould or kitchen-and-bathroom grade product is worth the modest premium.
Anti-mould paint is not a substitute for ventilation. Where mould appears on new paint in a Dubai bathroom, the extract is almost always the cause and the paint is treating a symptom.
Exterior systems
Ordinary masonry paint chalks and fades within about a year here. Exteriors need elastomeric or high-build coatings with genuine UV stability, applied over properly repaired render.
Elastomeric coatings also accommodate movement, which matters because the render is cycling through a wide daily temperature range. A rigid coating over a moving substrate cracks along the lines of the movement, which is what produces the hairline map-cracking seen on so many Dubai elevations.
Preparation and timing
Fresh plaster and screed must dry before being sealed. Painting over green plaster traps moisture and guarantees a failure, usually visible by the first summer. This is one of the few things on a renovation that genuinely cannot be accelerated.
On existing surfaces, a coating that is already chalking has to come off rather than be painted over. Testing a sample area at survey tells you which situation you are in, and it is a great deal cheaper than finding out after the whole elevation is coated.
| Position | What to specify |
|---|---|
| Internal walls and ceilings | Quality emulsion over sealed substrate. |
| Bathrooms and kitchens | Anti-mould or K&B grade — plus adequate extract. |
| Internal woodwork | Water-based satin or eggshell; yellows less than oil. |
| External render | Elastomeric or high-build, UV stable. |
| External woodwork | Marine-grade systems; expect short maintenance cycles. |
| Metalwork | Correct primer for the substrate; stainless where coastal. |
Related Questions
Why does paint peel in Dubai bathrooms?
Usually three things together: inadequate extract, standard emulsion where a moisture-resistant system was needed, and painting over a surface that was not properly prepared or was still damp.
Fixing the extract matters as much as changing the paint. Repainting a bathroom that has no working extract simply resets the clock.
How many coats should a quotation specify?
Two finish coats over an appropriate primer is standard for a repaint on prepared surfaces. New plaster needs a mist coat plus two finish coats.
If a quotation does not state coats or preparation, that omission is almost certainly where it differs from the more expensive quote beside it.
Why does exterior paint fail so fast in Dubai?
Ultraviolet exposure and thermal cycling. Ordinary masonry paint chalks and fades within about a year here, and a rigid coating over render that is moving daily cracks along the movement lines. Exteriors need elastomeric or high-build systems with genuine UV stability over properly repaired render.
Does anti-mould paint solve a mould problem?
No, it manages a symptom. Mould appearing on new paint in a Dubai bathroom is almost always a ventilation failure — an extract moving too little air for the room volume. Fixing the fan and the duct run is the solution; anti-mould paint is sensible insurance on top of it.
How long must new plaster dry before painting?
Longer than most programmes allow for, and it varies with thickness and conditions. Sealing green plaster traps moisture and produces a failure that shows within the first summer. It is one of the very few stages that genuinely cannot be accelerated by paying more.
Can I paint over a chalking exterior?
No. A coating that is already failing will take the new paint off with it, so the old system has to be removed and the substrate prepared. Testing a sample area at survey establishes which situation you are in and costs almost nothing compared with coating an entire elevation twice.
Which elevations fail first?
South and west, consistently — they take the most ultraviolet and the widest thermal cycling. It is why a whole-house repaint in an unsuitable system can look patchy after two years while the north elevation still looks acceptable.
Is water-based or oil-based better for woodwork?
Water-based, generally, for interior woodwork here. Modern water-based satin and eggshell products have closed most of the durability gap and they do not yellow the way oil-based systems do, which is particularly visible on white woodwork in a bright climate.
Does the paint brand matter?
Less than the system and the preparation, but it is not irrelevant. The meaningful differences are in binder quality and pigment stability, which is what determines how a colour holds up under this much ultraviolet. What matters more is that the product is specified for the position — an interior emulsion on an exterior wall fails regardless of brand, and a premium product over unprepared substrate fails just as fast as a cheap one.
What preparation should happen before painting?
Filling and making good, sanding, caulking at junctions, removal of any failed coating, and sealing or priming appropriate to the substrate. On new plaster that means allowing it to dry fully and then applying a mist coat before the finish coats. On existing surfaces it means establishing whether the current coating is sound — a sample area scraped and tested at survey tells you whether it can be overcoated or has to come off. This stage is most of the labour on a decoration job and all of the difference in how it looks in three years, and it is the single easiest thing to leave out of a competitive price without the omission being visible at handover.
Can I paint during the summer?
Internally, yes, with normal care. Externally it is more difficult, because paint applied to a hot substrate in direct sun flashes off before it has levelled, leaving brush and roller marks and compromising the film. Where external painting has to happen in summer, the response is to work the shaded elevations as the sun moves, start early, and accept that the usable working window is shorter. Where the programme allows, moving external decoration to either side of the peak months produces a visibly better result for the same money.