Sealing cracks in blacktop is crucial for preserving the integrity and longevity of the pavement surface. These cracks, if left untreated, can allow water to seep into the underlying layers of the pavement, leading to erosion, weakening of the structure, and ultimately causing potholes and other damage. By sealing cracks promptly, one can prevent water infiltration, which helps to maintain the stability and strength of the blacktop. Additionally, sealing cracks enhances the appearance of the pavement, creating a smoother and more visually appealing surface.