A new method for determining the flexibility of paints and other coatings has been developed. Coated aluminium strips are stretched and the damage caused to the coating during stretching is monitored by means of an automatic image processing system. The stretching device, with a lighting and camera system specially designed to withstand cold conditions down to −25°C, gives useful information about the performance of coatings in cold climates. In addition to the elongation at which the paint film starts to crack, the development of cracking is also measured. A reduction in the test temperature was found to impair the flexibility properties of paints. Ageing can either impair or improve the flexibility properties of paints. The effect depends on the pain and the weathering time.