How Humidity Affects Interior and Exterior Paint in Florida
- Jul 31
- 9 min read
Quick Answer
Humidity can affect how long the paint takes to dry, how well the paint adheres to
the surface, and how long the paint job lasts. Florida's moisture can prolong the
drying time of the paint, cause mildew to grow on the painted surface, and lead
to bubbling or peeling of the paint if the surface is not completely ready.
The Bathroom Had Been Painted Less Than a Year Ago
One day, a woman from Port Saint Lucie called to report that the paint in her
bathroom was already peeling.
It wasn't coming off in big chunks.
There were only a few small bubbles on the ceiling and a few dark spots above
the shower.
She kept saying, "But we just painted this room!"
When we got there, the bathroom was beautiful.
The paint job was nice, aside from the few small spots.
But those few spots were only noticeable if you got right up next to the shower
and looked up at the ceiling.
That's where the moisture was gathering every morning.
She said they had four people using the bathroom before leaving for work and
school.
One right after the other.
The mirror was always fogged up for almost an hour.
The fan was running, but no one ever left it on after they left.
That small oversight allowed the moisture to linger in the air and gather on the
walls.
The paint wasn't coming off the walls because it was old paint.
It was coming off because it was damp paint.
It was living in a room that didn't have the opportunity to dry out.
Florida Homes Have to Battle Moisture Everyday
Moisture is one of those things that is difficult to see, but it is difficult to get rid of
once it gets inside.
You can see it outside on days where the air is especially damp.
You can see it when your glasses are fogged up or when your concrete is damp
in the morning.
But it is also living inside your walls and on the paint in your home.
It likes to gather around your bathrooms and kitchens.
It likes to gather near windows and doors.
It likes to gather in shaded areas after a storm has passed over your
neighborhood.
It likes to gather on the stucco of your home long after the sunny side of the
house has dried.
That is why painting in Florida can be a bit more involved than you might be used
to.
The wall may look dry, but it may not be ready.
Paint Needs Time to Settle
Most homeowners know that paint will not be completely dry the next day.
But most homeowners also assume that the paint will be completely set and
ready to use as soon as it stops feeling damp to the touch.
But that is not always the case.
Paint will cure long after it has stopped feeling damp.
Humidity will prolong that process.
Moisture in the air will prolong the evaporation process of the water in the paint.
That means that the paint can stay damp long after you expect it to.
One homeowner ran his hand over a freshly painted door a few hours after it had
been painted.
The paint didn't come off on his hand, so he assumed that it was completely set
and ready to use.
But that evening, he shut the door to the room tightly and the next morning, he
found a few spots of the paint stuck to the door frame.
It wasn't coming off in big chunks.
It was only a few spots, and it was only the spots that he had touched when he
ran his hand over the door.
But it was enough.
Painting the Outside Can Be a Waiting Game
Florida's weather can be fickle.
It can throw painters for a loop.
It can start off one day, painting the walls of your home.
The sky is clear, and the forecast looks great.
But then, it can rain out of the blue around lunchtime.
Twenty minutes later, the sun is out, and the homeowner is asking if they can
come back out to paint.
Sometimes the answer is no.
Not because the painters want to prolong the job.
But because the wall still needs to dry out.
Stucco can hold water in its crevices and pockets.
Wood can still be damp along the edges and seams.
Cracks and crevices take longer to dry out than smooth surfaces.
The paint can trap that moisture in the wall.
So a day that looks great from the comfort of your car may not be the best day to
paint your home after all.
The Shaded Side of the House is Different Than the Sunny
Side
This is a common issue in Port Saint Lucie.
One side of the house gets plenty of sunlight, while the other side is shaded by
trees, other homes, or the direction that the house is facing.
After a rainstorm, the sunny side of the house will dry out much faster than the
shaded side.
The two sides might feel completely different to the touch.
One is warm and dry, while the other is still cool and damp.
The two sides cannot be treated the same way.
I had one homeowner ask me why we were painting the front of the house, but
not the side that was next to the fence.
The front of the house was completely dry, while the side was still damp.
But the two sides looked the same from the street.
He understood as soon as he put his hand on the damp side.
It had been shaded all afternoon and was still holding on to the moisture.
Humidity Can Cause Bubbling in the Paint
Bubbling in the paint is rarely a good sign.
It can be caused by a number of things, from heat to improper adhesion.
But it is often caused by moisture getting trapped underneath the paint.
Once that happens, the trapped moisture can push the paint away from the wall
and cause bubbling or blistering.
Small bubbles are not always an issue.
Sometimes, homeowners will press the bubbles back down and hope that they
disappear.
They usually come back.
The problem has not gone away, and painting over the bubbles will not make it
go away.
The bubbles need to be inspected, the wall needs to dry out, and the area needs
to be repainted.
Mildew Loves the Same Places that Moisture Does
If you walk around any home in Florida, you are sure to find a few spots that look
a little older than the rest.
It might be the wall behind the thick landscaping.
It might be the section of the wall that is under the overhang.
It might be the side of the house that does not get much sunlight.
It might be the corner of the house next to the dripping outdoor faucet.
These are all places where moisture likes to collect and linger.
Mildew knows this, and it will collect in these same places.
Algae will collect in these same places.
Inside the house, you are likely to find these same issues in the bathroom and
laundry room.
You might find small dark spots on the ceiling or on the walls.
You might find the paint looking dull in one area.
You might find the wall damp after a shower or after cooking.
Cleaning these areas can help, but so can improving the ventilation in these
areas.
If these rooms are consistently humid, the problem is likely to happen again.
Kitchens Can Create More Moisture Than You Realize
Bathrooms are often the culprits when it comes to indoor humidity, but kitchens
should also get some of the blame.
Steam rises from the boiling water.
It rises from the food that is cooking on the stove.
It rises from the dishwasher that is filling the kitchen with warm air.
It rises from the sink that is being used multiple times per day.
All of this moisture has to go somewhere, and it usually ends up in the air.
One homeowner found that the paint on the ceiling near the stove was peeling.
She assumed that there was a leak in the roof, but there was not.
The fan in the kitchen had stopped working, and the steam had been collecting in
the ceiling for months.
The peeling paint was only a small part of the issue.
Air Conditioning Can Help, But it is Not a Cure-All
Much of the excess moisture in Florida is sucked out by the air conditioning.
That is why our homes are so comfortable year-round, even when it is humid
outside.
But air conditioning cannot do everything.
Bathrooms still need ventilation, laundry rooms still need airflow, and leaks still
need to be repaired.
Windows that are collecting condensation still need to be addressed.
A room might feel cool and comfortable, but a wall might still be damp.
That is why painters look at the surface of the wall and not just the temperature of
the room.
Paint Finishes are Important in Moisture Rich Areas
Not all paint is created equal.
Some are better suited for certain areas than others.
Flat paint looks great in a bedroom, but it might not be the best option for a
bathroom that sees multiple showers every day.
Paints used in kitchens, bathrooms, and laundry rooms need to be able to stand
up to frequent cleaning and the occasional bit of moisture.
The finish of the paint matters, but so does the paint itself.
Preparation also matters.
Moisture resistant paint will not do much on a damp, dirty, or improperly
prepared wall.
The paint is only one part of the process.
You Cannot Rush a Damp Wall
This might be the most frustrating part of the entire process.
It is not something that can be helped, and it is not something that can be
avoided.
It is something that you have to work around.
Maybe you have guests coming over, or maybe you need to put the house on the
market.
Perhaps you moved your furniture out of the way already.
It might be inconvenient, but it has to be done.
If the wall is damp, it needs to dry out.
If the rain interrupted the exterior paint job, the wall needs to dry out.
If the bathroom does not have proper ventilation, that needs to be fixed.
It is much easier to wait and repaint a failed surface a few months later than it is
to deal with the disappointment of an early failure.
Signs that Humidity is Getting Out of Control
Some issues are obvious, but some issues start out small and unnoticed.
Look out for:
• Bubbles in the paint
• Peeling near the ceiling or windows
• Mildew spots
• Paint that is still soft to the touch
• Discoloration in bathrooms and kitchens
• Walls that stay damp after rain
• Condensation on windows
• Musty odors near paint
• Unevenly drying exterior walls
These are all signs that humidity might be impacting your paint job.
They are also all signs that you might need to address the source of the problem.
Frequently Asked Questions
Can humidity cause paint to peel?
Yes, humidity can prolong the drying process of paint and cause peeling, bubbling, or blistering of the paint.
How long does it take for paint to dry in humid weather?
It depends on a number of factors, including the type of paint, the temperature, the amount of air flow, the surface that is being painted, and the amount of moisture in the air.
Can you paint outside after it rains?
It depends on how much moisture is in the surface of the material that you are painting.
Stucco, wood, and other surfaces can hold water in their crevices and pockets, so it is important to wait until they are completely dry.
What is the best paint for a bathroom?
The best paint for a bathroom is something that can stand up to frequent cleaning and occasional moisture.
Ventilation is also an important consideration.
Why does mildew keep coming back after I repaint?
If the source of the mildew was not eliminated, then it is likely to return after repainting.
The surface should be cleaned, and the source of the problem should be addressed.
Final Thoughts
Humidity is simply a part of life in Florida.
We feel it outside, and it feels it inside our homes.
Moisture rarely causes an immediate issue, but it can linger and cause problems
down the road.
A bathroom is left damp for a few extra minutes every morning.
A shaded wall never dries out completely.
A kitchen is filled with steam every evening.
Then, one day, the paint begins to bubble or peel.
That is when the issue is noticed, but it is not too late.
Most humidity related issues can be avoided if the surface is properly prepared.
It should be clean, and it should be dry.
The right paint should be used, and the right time should be chosen for the paint
job.
Sometimes, the best thing a painter can do is wait.
Learn more about our Interior Painting Services for bathrooms, kitchens,
bedrooms, and other interior spaces.
If Florida's weather has been affecting the exterior of your home, be sure to check
out our Exterior Painting Service.
If you have any questions about humidity, peeling paint, or an upcoming paint
