Should you Paint Outside in the Heat
This is a common question. I am also often asked what the best time of the year is to paint outside. The best time in my opinion is late summer or early fall. The weather is more predictable and there are fewer temperature swings then in the spring.
The biggest problem with painting outside in the middle of summer is flash drying. If you paint in direct sun on a hot day this will occur. The surface of the home (siding) gets hot in direct sunlight. If paint is applied in this condition it will flash dry. I have actually seen steam raise from the surface when the paint is applied.
When paint dries too quickly it will create problems. The paint needs to be allowed to cure and have the solvent (water) evaporate over time. This allows the molecules of the paint to align and form a strong coating with good adhesion.
If painting is done on a hot day in the middle of summer then the paint should never be applied in direct sunlight. The painting should always be done on a side of the home opposite the sun.