I'm renovating my house's exterior on the coast and I need a paint that can handle intense sun and humidity without peeling off in two years like it did last time. Do you recommend local or imported brands? I've got a mid-range budget.
First things first, surface preparation is what most people skip and it's critical in tropical zones - if you don't clean the mold and dirt properly, any paint is going to peel off anyway. That said, beyond acrylics with UV and anti-algae, make sure it's two-component or epoxy paint if your budget allows, because they handle constant humidity way better than single-component ones. Imported brands like Sherwin-Williams or Jotun have a reputation for lasting, but honestly several decent local brands in your region probably work just as well and cost less; what matters is that you specifically ask for tropical climate paint with a matte finish (not glossy, it looks worse as it ages).
For tropical areas, what works for you is good-quality acrylic paint with UV protection, not the cheap stuff from the supermarket because that turns gray in a year. Look for paint with modified acrylic resins and anti-algae additives, because the humidity is brutal on the coast. Local brands can work fine if they're actually professional-grade (the kind used in commercial construction), but the real difference is in whether you get paint specifically formulated for tropical climate, not whether it's imported or not, so check the specs carefully before you decide. Oh, and apply it with two proper coats on a clean surface, because if you don't prep the base right, even paint from the gods will peel off just like the last one.
The last time I repainted my house on the coast, the same thing happened to me - after eighteen months the color was already looking dull and gray patches were starting to show up. The problem in tropical zones isn't just UV but the combination of humidity, salt in the air if you're near the sea, and those constant cycles of rain and sun. What makes the difference is investing in paint with built-in UV protection and, most importantly, using a good primer beforehand.
I second what was said earlier about acrylic quality, but I'd add that you specifically look for elastomeric or flexible paints, which handle the material's expansion and contraction better with temperature changes. Local or regional brands are often formulated exactly for your climate - they make more sense than European ones directly imported. Just make sure it has at least a two-year written warranty against peeling, because that gives you clues about what they themselves trust in.
A mid-range budget lets you get something decent without going premium. Before painting, wash the facade thoroughly with water and let it dry completely (this is critical), apply a moisture-resistant primer, and then at least two coats. If you do that, you should get five years without problems, and if it doesn't last, you've got the warranty.
What really works in coastal areas is investing in paint with anti-algae and anti-fungal additives, not just UV protection. Tropical humidity is tricky because mold grows even if the paint doesn't peel, and that's what makes it look terrible in six months. Decent local brands work fine if they have that specification; you don't need expensive imports, but don't go for the cheapest either.
Here's the trick nobody mentions: before painting, treat the facade with an anti-stain product or penetrating sealer specifically for humid zones. It costs a bit more but saves you years of headaches. If your previous wall lost its paint quickly, it's probably because humidity was rising from the base or there were dormant algae in the concrete. With the sealer underneath, the paint lasts much longer.
Look for branded acrylics with at least a 5-7 year warranty in tropical climates (check the can, almost all of them list it). Also make sure it's high opacity and can be applied directly without primer on surfaces in good condition. And one more thing: don't paint during rainy season or when it's very hot; wait until the temperature is between 15 and 28 degrees if you can, because humidity during drying is your number one enemy.
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