This self-leveling sealant is used in many different areas of concrete. Mastic sealed around pools, patios, driveways, sidewalks, parking lots and walkways helps prevent soil saturation and adds life to your concrete by reducing the dissolving effects of water erosion. It could increase the longevity and protect the gaps and allow for settling and insure your concrete has room to move without causing damage to the structure itself. Mastic helps to prevent weeds in the joint as well as unwanted pests, such as ant colonies, roaches, and other bugs. Replacing the mastic around these areas is a maintenance procedure, so you what to keep it fresh and elastic.