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25 April 2018

Exterior Painting

Summer is almost upon us and many of you are about to embark in the yearly ritual of house paint maintenance. Exterior painting projects present a variety of challenges, ranging from the type of project and surface to be painted, to geographic location and the spectrum of diverse, outdoor conditions. Despite all these factors, our clients are more demanding than ever and require their properties to be protected by a film that is only a one-thousandth of an inch thick — so how do we ensuregood exterior paint performance, especially when applying paint in summer heat? Here are some things to consider:

First, the key to any good paint job is always surface preparation. Wash the surface to remove loose dirt and dust. Next, scrape and sand surfaces to remove loose, peeling and flaking paint. Keep in mind that scraping or sanding surfaces of older buildings (especially pre-1978) may release dust containing lead or asbestos, so be sure to wear the appropriate protective gear. Once the surface is clean, prime any exposed substrates with the appropriate primer. We have several types depending on the substrates you will be facing, but your go to products will mainly be the Colortek Anti carbonation Primer or our Colortek Primer White.

Exterior Painting

Next, choose the right paint for the job. Today's 100 percent-acrylic paint systems offer the best performance on a variety of surfaces. If you are painting directly on concrete, or renovating a parking, we would recommend using our Anti carbonation paint. If renovating a building facade, you might consider one of our flexible, waterproofing paint for vertical surfaces such as Oxibond 4001.

Also, consider how color can affect paint performance. Darker colors absorb more heat and energy, which cause substrate movement that can shatter the bond between previous coats and the substrate — especially wood. Using lighter colors is beneficial, as they reflect more light and do not absorb as much heat and energy; thus, improving film durability. The fact that lighter colors do not absorb as much heat also suggests that lighter colors can improve energy efficiency.


Here are some things to consider when applying paint in the summer heat:

When painting in warm weather, a water-based paint will dry very quickly. When this happens, the paint can be dry, but film formation or curing may be incomplete, which will compromise long-term durability.

When painting exteriors, it's best to avoid having more than two or three of the following conditions present simultaneously:

  • Painting under very hot conditions, above 40º C
  • Painting in direct sunlight, especially if the paint is a dark color
  • The surface being painted is hot
  • Conditions are breezy or windy


One of the best ways to try and stay within these guidelines is a technique called, “chasing-the-shade." Start applying paint on the shady side of a building and follow the shade as the sun moves overhead.


Another way to minimize the effects of summer heat is to paint early in the morning when it is cooler. If anything, try to avoid painting in the late afternoon when surfaces have had a chance to heat up and it becomes too hot to apply paint. Last, keep your brushes and rollers loaded with paint; work in smaller areas; and apply paint at a consistent, steady pace to get a good, uniform finish.

Exterior Painting
Exterior Painting

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