Coastal humidity and the blistering wall
Walk any older street within a kilometre of the sea — Deira, Sharjah's Al Majaz, Ajman corniche, RAK's old town — and you will see paint blistering: bubbles, flaking sheets, and the tide-mark staining of salt migrating through render. The mechanism is simple. Moisture gets into the wall, from humid air, a plumbing leak, a dripping AC line or rising damp, and when the sun heats the surface, that moisture turns to vapour and pushes the paint film off from behind. No paint, however premium, survives being applied over a wet substrate.
Sea-facing apartments deserve one more note: choose sheens deliberately. Full matt marks easily in humid rooms; a washable matt or eggshell in bathrooms, kitchens and hallways costs slightly more per litre and survives UAE condensation far better.