Summer feels like the right time to paint. The days are long and the weather is dry. But heat and sun cause their own problems, even in San Diego.
Here are the issues I watch for, and how to avoid them.
Paint that dries too fast
Hot, sunny surfaces pull moisture out of paint quickly. That sounds good, but it isn’t. When paint dries too fast, it doesn’t level out. You see brush marks and roller texture. You also see lap marks, which are darker stripes where one pass dried before the next one blended in.
The fix is simple. Work in small sections and keep a wet edge. Don’t stop in the middle of a wall. Follow the shade around the house, and paint each side when it’s out of direct sun.
Blistering
Blisters are small bubbles in the paint film. Heat is one cause. If a hot wall is painted in full sun, the surface can skin over while the paint underneath is still wet. Moisture or vapor then pushes up from below. Moisture trapped in the wall can do the same thing.
Don’t paint a surface that’s hot to the touch. Let it cool in the shade first. If you see blisters on an existing wall, find out where the moisture is coming from before repainting.
Poor adhesion on a hot wall
Dust and chalky residue on old paint can keep new paint from bonding. Summer sun makes chalking worse. A good wash and the right primer help new paint hold on. Let the wall dry fully after washing. A wall that looks dry on the surface can still be damp underneath.
Fading and sun-baked surfaces
Strong sun breaks down color over time, so south and west walls often fade first. Deep, saturated colors tend to show fading sooner than lighter ones. If you’re choosing a color for a very sunny wall, ask about how it will hold up.
Surfaces that have baked for years can be dry and thirsty. Old wood and stucco soak up paint and can need extra primer or an extra coat. That’s normal. It’s one reason prep takes as long as it does.
Follow the shade
On an exterior job, I plan the order of the walls around the sun. In the morning, the sun hits the east side, so we start with the west or north walls. As the day goes on, we move to the sides that have gone into shade. That keeps paint out of the hottest hours and gives it time to cure evenly.
Coastal specifics
Near the ocean, summer mornings can start with marine layer and a damp surface. Paint needs a dry surface, so we wait until the wall has dried out. Salt in the air also leaves a film on walls. It needs to be rinsed off before painting, or paint can have trouble bonding.
Afternoon breezes can blow dust onto wet paint. Start early, finish a wall before the wind picks up, and keep things tidy around the work area.
Read the can
Every paint has a range of temperatures it works in, and it’s printed on the label. Follow it. If the weather is outside the range, wait a day.
When to call
If you’d rather not race the sun yourself, that’s what we do. We plan the order of the house around the weather. See our exterior painting page, or call me at (858) 333-2396 for a free estimate. You can also use the contact page.
FAQ
Is it okay to paint a house in the summer?
Yes, with a plan. Summer gives you long, dry days, but heat can make paint dry too fast. Work in the shade, follow the sun around the house, and avoid hot surfaces. On the coast, wait for the marine layer to burn off and the wall to dry.
What causes paint to blister?
Blisters come from trapped moisture or vapor, or from painting a hot surface that skins over too quickly. Dirty or damp surfaces make it worse. Let the wall cool and dry, prep it well, and find any moisture source before repainting.
What time of day is best to paint a house exterior?
Paint each wall when it’s in the shade. That usually means starting on the side the sun hasn’t reached yet and moving as the shade moves. Avoid early morning damp and the hottest part of the afternoon. Always check the paint label for its temperature range.