Exterior guide
Why does exterior paint fail faster near the beach?
Paint near the beach fails for the same reasons it fails anywhere: moisture, sun and poor adhesion. The coast just delivers all three harder and faster, with salt on top.
If you own a house on the barrier islands or along the bay, it helps to know what each kind of failure looks like and what causes it, because the fix depends on the cause. This guide walks through the common ones. For how we repaint coastal homes, see exterior painting.
What the beach adds
- Salt spray leaves a film that holds moisture against the surface and gets into every gap.
- Reflected sun off water and sand increases UV exposure on the water side.
- Wind drives rain and salt sideways into walls, joints and openings.
- Humidity stays high for long stretches, which slows drying and feeds mildew.
- Corrosion of metal is much faster close to salt water.
Peeling
What it looks like: paint lifting away in flakes or sheets, often down to bare stucco, wood or an older coat.
Common causes: painting over salt, dirt or chalk; painting onto a damp surface; moisture getting behind the paint through cracks or open joints; incompatible coatings; too thin a coat.
The fix: scrape back to sound paint, find and stop any moisture source, clean thoroughly, prime bare areas and repaint.
Blistering
What it looks like: bubbles in the paint film. Cut one open: if there is water or bare surface underneath, it is moisture related; if there is paint underneath, it may be heat related.
Common causes: moisture behind the paint, painting a damp wall, or painting in direct hot sun so the surface skins over too quickly.
The fix: scrape and sand the blistered areas, deal with the moisture, and repaint in the right conditions.
Chalking
What it looks like: a powdery residue on the surface that rubs off on your hand, along with faded colour.
Common causes: UV breaking down the binder in the paint over time. Faster on sunny walls and with lower quality coatings.
The fix: wash the chalk off thoroughly. If the surface is still powdery, a bonding primer goes on before the finish coats.
Mildew and algae
What it looks like: black, grey, green or brown spots and streaks, often on shaded walls, under eaves and behind plants.
Common causes: moisture, shade and poor airflow, plus a surface for growth to hold on to.
The fix: clean and treat to kill the growth, rinse, let dry, then paint with a coating that resists mildew. Trimming plants back and improving airflow helps it stay away.
Rust bleed
What it looks like: orange or brown streaks running down from railings, fixtures, fasteners, shutter tracks or hose bibs.
Common causes: salt accelerating corrosion of metal that was not properly primed or has lost its coating.
The fix: treat the metal itself (remove loose rust, prime with a rust inhibiting primer, finish with a metal coating), then clean or stain block the wall below before painting.
Efflorescence
What it looks like: white, powdery or crusty deposits on masonry, sometimes pushing the paint off.
Common causes: water moving through block or stucco and carrying salts to the surface.
The fix: clean the deposits off, find and reduce the source of water, let the wall dry, and use a suitable masonry primer before painting.
Cracking and alligatoring
What it looks like: fine cracks in the paint itself, or a pattern like reptile skin on older, thicker coatings.
Common causes: old, brittle paint that can no longer flex with the daily heating and cooling of the wall, or layers that were not compatible.
The fix: remove the failing layers back to a sound surface, prime and repaint with a flexible coating.
Caulk failure
What it looks like: shrunken, cracked or loose caulk around windows, doors and trim.
Common causes: sun, movement and the wrong type of sealant for the joint.
The fix: cut out failed caulk, clean the joint and re-caulk with an exterior grade sealant before painting. It is one of the cheapest ways to stop water getting behind paint.
How to make the next paint job last longer
- Diagnose the failures you have, and fix the causes, not just the symptoms.
- Clean off salt, chalk and growth, and let the house dry.
- Repair cracks, rot, rust and failed caulk.
- Prime the right areas with the right primer.
- Use coatings suited to coastal exposure, and apply two full coats.
- Rinse the house gently once or twice a year afterward.
Questions we hear
Why is my new paint peeling already?
Usually the surface was not clean or dry enough, the old coating was chalky or failing underneath, or moisture is getting in behind the paint. The cause has to be found before repainting, or it happens again.
What causes bubbles in exterior paint?
Blisters usually come from moisture behind the paint, or from painting in direct hot sun or onto a damp surface. Small blisters can be scraped and repaired; widespread blistering points to a moisture problem.
Can you paint over mildew?
No. Mildew has to be cleaned and treated first. Painting over it traps the growth, and it comes back through the new paint.
How do I stop rust stains on my walls?
Treat the metal that is causing them: clean off loose rust, prime with a rust inhibiting primer and finish with a coating made for metal. Then clean or prime the stained wall before painting.
Seeing any of these on your beach house? Read more about exterior painting, see our Clearwater Beach page, or call (727) 490-9640 any time.