Questions relating to hot weather exterior painting have been coming up for a couple months now and since our primary market for home painting and commercial painting is right here in Phoenix, Arizona, we feel we should post some points about hot weather exterior painting in this area.
What you need to always remember is as soon as you pour your exterior paint into your application container, if it’s hot outside, you will immediately begin to lose water to evaporation. Really, at any temperature above absolute zero, it is possible to lose water molecules to evaporation. Therefore, the warmer the temperature is, relative to absolute zero, the more evaporation you will experience over a given duration of time.
When paint dries too fast, the added binders and pigments that define the quality of the pain you use, can’t blend and bind together well. As a result, the protective paint film may not be as durable or flexible as you need. We believe the ideal application temperatures for exterior painting fall in the range between 50 degrees Fahrenheit to 90 degrees Fahrenheit; when temps rise into the 90 + degree range, your paint begins to suffer if the appropriate measures aren’t taken.
When the day’s temperature will be in the 100 degree Fahrenheit range, we may consider pushing exterior painting jobs out a week or so until we know we can get a window of weather that will allows us to paint in temps below 100 degrees F. But of course, more often than not our jobs need to be done during the Arizona Summer months so we wanted to share some ideas you may want to consider employing for your Arizona Summer exterior painting job.
- Try and stay out of direct sunlight or make sure your paint container is always under shade. And follow the shade around the building because the direct sunlight will heat up the surface to be painted and can cause the paint to dry too quickly. We recommend you start work on the west and north sides of the structure early in the morning when temps are cooler. Work on the east and south sides of the structure later in the afternoon after those surfaces have had time to cool
- During cases of high heat and low humidity, it’s okay to reconstitute your paint up to as much as 10 percent but be very cautious with this and only reconstitute in very small batches while the rest of the paint stays in its original covered container and kept in shade. It is possible to thin paint with water but we recommend using a paint extender that has been formulated by the same manufacturer of the paint you’re using. If using water and you’re not careful, you can easily end up with a mix of thin paint that is made up more of water than paint
- Consider icing down your paint containers. You may even consider dropping some ice cubes into your paint before you insert your lines and fill with paint. The ice will keep the paint cool and help prevent the paint from thickening before it’s sprayed, brushed or rolled onto the surface thereby extending the paint’s working life in the container and helping to afford critical extra minutes for the coating to dry at at a more ideal rate
The fact is that we all live and work in Arizona and painting needs to be done all throughout the year. We paint as much during the Summer season as we do outside of the Summer season and we have never had any issues. Just make sure to take time and plan your project around the early mornings and late afternoons, and consider the surface temperatures for the walls you’ll be painting. Even though they heat up during the hours they receive direct sunlight, they also can cool down relatively quickly once that direct sunlight is gone. Plan you project well and protect your paint; you should be in great shape.
Please don’t hesitate to contact us for any advice on hot weather exterior painting by calling us or by clicking here and emailing us your contact info. We will contact you promptly and answer any questions you have regardless of whether your questions are about commercial exterior painting or residential exterior painting.