Florida is brutal on paint. Between the relentless UV, salt air off the ocean, humidity that never really drops, and afternoon thunderstorms from June through October, most exterior coatings start failing within three or four years. If you’ve watched paint on a Miami home blister, chalk, or peel — that’s not bad luck. That’s the wrong product, or the wrong prep.
At KoARQ, we paint homes across Miami Shores, Coral Gables, Pinecrest and Coconut Grove. This guide covers what actually works in South Florida — the paint chemistry that holds up, the brands we trust, and the prep steps that make the difference between a job that lasts 3 years and one that lasts 10.
Why Florida Is So Hard on Exterior Paint
Most paint is tested in temperate climates. Florida is not a temperate climate. Here’s what you’re actually dealing with:
- UV intensity. South Florida receives some of the highest UV radiation in the continental US. UV breaks down the binder in paint — the component that holds pigment to the surface. Cheap paints use cheaper binders that degrade faster.
- Salt air. Within a few miles of the coast, airborne salt deposits on every surface. Salt is hygroscopic — it absorbs moisture — and it’s corrosive. On stucco and wood, this accelerates paint failure at joints, edges, and any crack.
- Humidity and heat cycling. High humidity means the substrate never fully dries out. Daily temperature swings cause surfaces to expand and contract. Paint that can’t flex will crack.
- Mold and mildew. Warm, humid conditions are ideal for mold growth. Without mildewcide additives, paint will develop dark staining within a year or two on shaded walls.
What to Look for in an Exterior Paint for Florida
Not all paints labeled “exterior” are suited for Florida conditions. Here’s what matters:
100% Acrylic Latex
Acrylic latex is the correct chemistry for Florida exteriors. It expands and contracts with the substrate, resists moisture far better than oil-based alternatives, and dries quickly — important in a humid climate where long dry times invite mold growth during curing. Avoid alkyd (oil-based) products for exterior Florida use unless you have a specific application reason.
High Solids Content
Solids are what’s left on the surface after the water carrier evaporates. Higher solids (look for 45%+ by volume) mean a thicker, more protective dry film. Cheap paints have high water content and thin dry films — they look fine going on but fail quickly.
Built-in Mildewcide
This is non-negotiable in South Florida. Any premium exterior paint sold today includes mildewcide. If a product doesn’t list it, skip it.
UV-Resistant Pigments
Titanium dioxide is the industry standard white pigment and offers good UV resistance. Premium paints add additional UV-stabilized resins. On south-facing walls that get full Florida sun, this matters enormously for fade resistance.
The Brands We Use at KoARQ
We’ve tested a lot of products across a lot of Miami homes. These are the lines we specify and why:
Sherwin-Williams Duration
Our most-used exterior product. Duration is a 100% acrylic with excellent film build, strong mildewcide protection, and proven longevity in high-humidity coastal environments. The Lifetime Limited Warranty backs it up. It’s what we apply on most standard stucco and masonry jobs in Coral Gables and Miami Shores.
Sherwin-Williams Emerald
When clients want the best available product, we go Emerald. The resin system is more advanced — better adhesion, better flexibility, better UV resistance. On homes within a mile of the water, on premium projects, or when the existing surface has challenging adhesion conditions, Emerald is worth the premium.
Sherwin-Williams Loxon XP
For bare or problem stucco — anything that’s been repaired, has hairline cracks, or is near-new construction — Loxon XP is our go-to. It’s specifically engineered for masonry and stucco substrates and bridges hairline cracks as they form. In Florida’s wet-dry cycles, this matters.
Surface Prep: Where Most Jobs Fail
Paint is only as good as the surface it’s on. In Florida, prep is not optional — it’s where durability is made or lost.
Pressure Washing
Every exterior job starts with a thorough pressure wash. We’re removing mold, mildew, salt deposits, chalk from the existing paint, and loose material. On stucco, we typically use 1,500–2,500 PSI. Let the surface dry fully before painting — at least 24–48 hours in South Florida humidity.
Crack and Joint Repair
Florida stucco cracks. It’s not a defect — it’s thermal expansion and settling. Every crack wider than a hairline needs to be opened slightly, cleaned, and filled with an elastomeric patching compound before paint goes on. Painting over cracks traps moisture and guarantees early failure at those points.
Priming
On bare or repaired stucco, a quality masonry primer is required. This seals the surface, normalizes porosity so the topcoat applies evenly, and improves adhesion. We use Sherwin-Williams Loxon Conditioner on masonry. Skipping primer on fresh stucco is one of the most common mistakes we see on DIY and cut-rate jobs.
Caulking
All penetrations — window frames, door frames, utility lines, light fixtures — need to be caulked with a quality paintable siliconized acrylic caulk before painting. This is where water gets in. In Florida, if water gets in behind paint, the paint fails. It’s that simple.
Common Mistakes We See on Florida Homes
- Painting over mold without treating it first. You have to kill it — dilute bleach solution or a commercial biocide — before washing. Paint doesn’t kill mold; it just covers it temporarily.
- Painting in the rain or high humidity. Paint applied to a damp surface or in rain won’t adhere properly. In South Florida, this means timing around afternoon storms and not painting immediately after overnight rain.
- Using interior paint on exterior surfaces. Interior formulations lack the UV resistance, moisture resistance, and flexibility of exterior paint. We see this on soffit boards and under-eave areas — the homeowner grabbed the wrong can.
- Applying one coat instead of two. One coat is never adequate on an exterior in Florida. Film build matters for protection. Two full coats, properly applied with adequate dry time between them, is minimum.
- Ignoring the substrate. Paint is not a repair material. Spalled stucco, rotting wood trim, rusting metal — these need to be fixed before painting. Paint over a damaged substrate will fail at the damaged area regardless of paint quality.
How Long Should Exterior Paint Last in South Florida?
With proper prep, premium product, and correct application, exterior paint on a Florida home should last 8–12 years before full repainting is needed. We back our work with a written 2–5 year warranty, depending on the scope of the project.
Signs it’s time to repaint before paint fails completely: fading (especially on south and west elevations), chalking when you run a hand across the surface, hairline cracking that’s spreading, or mold returning faster than usual.
KoARQ’s Process
Every exterior job we do follows the same process:
- Initial walkthrough and surface assessment
- Full pressure wash and mold treatment
- Crack repair, patching, and caulking
- Primer on bare and repaired areas
- Two coats of premium paint (Sherwin-Williams Duration or Emerald)
- Final walkthrough with the homeowner
We use Purdy brushes and rollers, which maintain consistent application quality. We don’t rush — proper dry time between coats is built into our schedule, not squeezed out for speed.
Get a Free Quote
If your Miami-area home is due for exterior painting, we’re happy to come out, assess the surface conditions, and give you an honest quote. We work across Miami Shores, Coral Gables, Pinecrest, Coconut Grove, and surrounding neighborhoods.
Request a free quote or call us at (305) 848-9992. We speak English and Spanish.