Engine Block Stop Leak Prestone Products 16.5 oz

Prestone® Triple Seal Protection™ Stop Leak made with DuPont™ Kevlar®** for Radiator, Engine Block, and Head Gasket are revolutionary stop leak products from the leader in cooling system innovation. These products stop leaks fast and seal them permanently without blocking or corroding the cooling system. The effervescent beads break down and quickly locate the leak, while the DuPont™ Kevlar™ resin forms a web that binds to metals, and an acrylic polymer hardens and secures the seal to make it permanent.