There is a height on every west-facing building in this city where the damage stops. Stand close to a wall on the Aouama ridge and you can see it — a horizontal at roughly the second floor, above which paint holds and below which it does not.
That is the salt line. Onshore wind carries marine aerosol inland and drops most of it in the first thirty metres of elevation. Everything beneath the line is in a chemical argument it cannot win; everything above it is merely weathering.
Four materials come through it honestly. Lime render, because it breathes and can be patched forever. Tadelakt, for the same reason, plus it likes water. Cedar, if it is fed and never sealed. And hot-dip galvanised iron — not painted mild steel, which is a two-year decision dressed up as a permanent one.
Everything else is a maintenance schedule pretending to be a material. There is nothing wrong with that, provided the owner knows which one they have bought.