Once the paint cures, it could start to peel away from the surface. When the paint takes longer to dry, the surface stays wet longer, attracting insects, dirt, grime, and other debris.
Cold weather also reduces the overall life expectancy of the paint. Oil-based paints thicken in cold weather, causing stiffer brushing, heavier application, and less coverage per gallon. Humidity refers to the measurement of water vapor in the air.
Excessive humidity results in the formation of water vapor on the freshly painted surface. The ideal humidity level for exterior painting is between 40 and 70 percent. When painting a wood surface, you must consider humidity because the wood absorbs moisture from the surrounding air.
Paint needs several days to cure, and as the temperature dips, dew can form on surfaces and cause the water in the paint to evaporate too slowly. That affects how the paint holds up over time, including how well it resists cracking.
Colder temperatures and moisture on the surface can also result in staining or mildew. According to de Paz, spring and fall are the ideal seasons for painting just about everywhere in the country.
And what about an upper limit? You will, however, want to pay attention to the surface temperature of the exterior walls of your house. Then we mount the boards on angled racks on the roof of our headquarters in Yonkers, N. We wait. Each year of testing is equivalent to about three years on vertical surfaces.
Three years later, our results give you an idea of how the paint will look after nine years. We also test for mildew resistance by placing painted panels on vertical racks in a shady area of our campus.
All are self-priming, but be sure to check the can for situations when priming is advisable. For more details, check our paint buying guide for exterior and interior paint. What temperature is too cold for a beagle? Airbrush Paint?
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Still have questions? Find more answers. Previously Viewed. Unanswered Questions. To prevent problems, always follow the manufacturer's recommendations for recoat times. Note that direct sunlight or shade can cause surface temperatures to vary between different areas on the same structure.
This is another factor that impacts drying times and recoat times. Many major paint manufacturers offer special paints that are formulated for cold weather.
Most of these are rated for temperatures no lower than 35 degrees F. It's best to use one of these paints if your project must be completed in cold weather. A paint that's designed for lower curing temperatures is more reliable than standard paints mixed with additives for freeze-resistance or thinned for easier application.
Note that the temperature must be at or above the minimum recommended curing temperature for the entire curing process, not just during application. If you add a fresh coat of paint in degree weather, but then the weather turns colder an hour later, the paint may not cure properly even though it will eventually dry.
Because paints are thicker in lower temperatures, it's best to use relatively stiff brushes with nylon, polyester, or Chinex bristles, all of which tend to work well with thicker paint. The minimum application temperature specified on your paint can relate not only to the air temperature but also the temperature of the surface to be painted.
Often, the wall or ceiling surface is colder than the air, especially if there is wind. If the air is 55 degrees F, but the wall surface you're painting is only 40 degrees F, it's as though you're painting in degree weather. Painting professionals use infrared thermometers to take the guesswork out of painting in questionable temperatures. These emit an infrared beam to measure the surface temperature of anything you point it at.
Before beginning work on your project, check local forecasts and find a stretch of a few days when temperatures will be their highest and the sun will be out. You'll need to have a few days in a row when temperatures don't drop below the minimum for the paint you are using because you also need to factor in drying time for multiple coats. Plan each coat for times when the sun will be shining on the area you are painting.
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