Paint answers to the weather here
Paint is chemistry, and chemistry cares about temperature and moisture. Most emulsion paints sold in the UAE are formulated to be applied between roughly 10 and 35 degrees on a surface that is dry and stable. For half the year, an exterior wall in Dubai or Abu Dhabi sits well outside that range by mid-morning — a west-facing villa wall in July can reach 60 degrees or more at the surface, hot enough to flash-dry emulsion before it can level out. The result is visible lap marks, poor adhesion and a coat that starts failing within a couple of years instead of lasting five or six.
Humidity is the other half of the equation. On the Gulf coast in August, relative humidity regularly climbs past 80 per cent overnight. Water-based paint cures by evaporation, and evaporation slows to a crawl in saturated air, so recoat times stretch and soft films pick up dust and fingerprints. Trapped moisture is also the main cause of the blistering you see on older buildings near the sea — bubbles under the film where vapour pushed its way out.