Crack sealing is perhaps the most important step in any pavement maintenance program. It is one of the most cost-effective techniques available when it comes to prolonging the life of your asphalt pavement. Cracks can be a result of various factors including freeze/thaw cycles, differential settlement, chemical spills, etc. Once cracks form they allow water into the foundation of your parking lot. Many foundations are made of limestone which washes away easily when introduced to water. Once the foundation erodes away the pavement loses the support it needs to perform properly.