Insulation in the external walls and roof have had little impact on the inside temperature when the weather is hot. When the weather is in the ‘thirties’ the inside temperature is uncomfortably warm requiring the sustained use of the split system air conditioner with moderate results. In the forties the home is so hot that the ‘air con’ has no impact and we generally leave the house for an alternative cool environment. In January 2016 Sean from Corrosion Control Australia spray coated the roof. The result has seriously exceeded our most optimistic expectations. Successive forty plus degree days have left the house comfortably cool and we only used the air conditioner intermittently on the second and third day.