Does cool paint technology really work?

In a recent study conducted by Marley’s paint manufacturing partner, a good quality “white” roof paint – similar in quality to that of Marley M22 Ultimo – was tested against a leading paint manufacturer’s cool technology paint in white. The aim of this study was to determine if cool technology performed better than a standard good quality white roof paint, in its ability to deliver a cooler roof.

Before we reveal the results, lets look at the test method.

  • Both paints were applied on a 3.295m x 0.515m galvanized panel (2 coats each) a meter, one on each side, with a 1.262m gap in the middle that was left unpainted. (See figure below)
  • Paint was left to dry, and 5 different temperature readings were taken on both paints, as well as the middle “no paint” and also the back of the panel, where an average was calculated.
  • Temperature measurements were taken every hour for 4 hours and after every hour the panel was rotated.
  • Nine DFT (dry film thickness) readings were also taken and an average was calculated.

The results!

The test revealed that on the front of the panel, the good quality roof paint in standard white performed 1.16% slightly cooler than the cool technology paint and 2.46% cooler on the back side of the panel.

There was also a temperature reduction of the painted sheet of approx. 31% ( this translates to approx. 15⁰ Celsius ) when compared to an unpainted galvanized sheet.


A good quality roof paint like Marley M22 in white, will not only cool down your roof, but also provide a coating that is long lasting and tough.

Want to take it a step further?

Marley’s dual insulation system provides further steps to ensure your home remains cooler in the summer and warmer winter.

Here’s how it works! Marley’s Radiant Barriers stops heat transfer created by the sun in its tracks, this results in a cooler home during the hot summer months. Combine that with Marley’s Polywool – a recycled polyester ceiling insulation – that literally acts like a duvet, sealing off the roof loft to prevent heat from within the house leaking out.

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