In Arizona, the harmful UV rays from the sun are known to fragment the top layer of the asphalt leading to erosion.  It is imperative to residents of Arizona to understand that they live in a desert climate that is inherently aggressive because of the scorching sun. That is why seal coating in Tucson is necessary and ought to be applied every two to three years. The black lustrous coating on the asphalt will remain a good preventive measure to help with erosion.