Coating failure can be observed as soon as the coating’s colour begins to fade, craze, delaminate or, in the case of smooth finished coatings, to blister and spot corrode. There are a number of reasons which cause coating failure, these include:
The prolonged exposure of a coating to UV light, causing the paint to harden and get brittle. This limits the coating’s ability to expand and contact with the substrate, negatively affecting its adhesive qualities and resulting in delamination.
Moisture that lays on the coating’s surface can then penetrate causing discolouration. Over time this can result in a lifting of the coating, and corrosion in the cases of steel substrates.
Chalking: This is a naturally occurring process over time, where the paint fades away. However, this process can result in the loss of important, additional pigments such as those added to enhance colour or offer UV stability.