Spray paint may crack when the first coating is sprayed on too thick and another layer is applied too soon. The top layer of spray paint dries, and the first layer remains slightly wet, causing wrinkling that separates the top layer and eventually causes it to crack.
Painters can avoid spray paint cracks by reading labels to learn how long to let spray paint sit before applying another layer or coating. Different brands of paint require unique amounts of dry time. Labels may also provide advice on the affects of certain weather conditions or temperatures. Certain materials are more porous as well, which can affect dry time and the number of coats needed.