Walk a beach-town street and you can spot them: houses repainted two or three summers ago already chalking, blistering, or peeling on the sun side. The paint gets blamed. The prep did it.
The three attackers
Salt. Salt film settles on siding and pulls moisture from the air, keeping the surface subtly damp. Paint applied over unwashed, salty siding is bonding to a contaminated surface — it lets go early, guaranteed.
UV. The Gulf Coast sun degrades the resin that holds a paint film together. South- and west-facing walls take the beating, which is why one side of a house always fails first.
Humidity. Moisture pushes through walls from inside and out. Trapped under a poorly bonded film, it blisters the paint off from behind.
What real prep looks like
Pressure washing that actually removes salt and chalk — not a quick rinse. Mildew treated with the right solution, because painting over mildew just gives it a fresh canvas underneath. Peeling areas scraped and sanded to a sound edge. Bare wood spot-primed. Caulk renewed at joints where water enters.
Film thickness: the invisible shortcut
Every paint has a published spread rate — how far a gallon should stretch. Stretch it further and you get a thin film that UV burns through years early. "Two coats" sprayed on heavy and dry-rolled thin is the oldest shortcut in the trade. We apply per the manufacturer's published instructions and document the coats in our daily photos, so you're not taking anyone's word for it.
More: interior paint for humid rooms, signs it's time to repaint, and the painting service page.