Painting or coatings may be applied, but the effectiveness of these solutions may be very short term with little or no guarantee and could result in insufficient daylight at other times of the year when it is required. The only effective way of reducing heat transfer through rooflights is by reducing the light passing through the rooflight.

Consideration should also be given to the internal heat gains and ventilation strategy of the building, and it should also be considered that lightweight clad buildings are at a greater risk of overheating from the sun irrespective of the presence of rooflights.

Any coating applied may not adhere adequately to the surface, or may require to surface of the rooflight to be damaged as part of the preparation process and therefore invalidate both the manufacturers service life guarantee and degrade the non-fragile performance.