Christys ROOT BAN Drain Pipe Adhesive is made for exterior drainage systems and works to stop root intrusion at the joint. Root intrusion is the leading cause of failure in landscape drainage systems as roots enter drain lines through poorly-protected push-fit connections and cause premature system failure until the roots are mechanically removed or the system is replaced. This special adhesives formula inhibits root penetration, and then the adhesive bonds and seals connections. This two-step process effectively prevents roots from entering your drainage system so you can rest easy no matter how big that tree in your backyard grows. This adhesive offers even application and full coverage. It is also designed to ensure optimal strength while retaining flexibility to reduce the risk of separation, keeping your pipe clean and clear. By eliminating chemical and mechanical cleaning as well as the need to fully repair drainage system joints, this low VOC, American-made adhesive can save you large sums of money and massive amounts of stress and worry. Root-Ban is a special adhesive for joining and deterring root growth at point of contact on Polyethylene, Polypropylene, Styrene and HDPE non-pressure drainage systems. It is not a solvent cement. Do not use a primer.