JENOLITE Stop Leak is the instant waterproof sealant. Ideal for sealing leaks and drips fast. The hardwearing, flexible formulation has been specifically developed to fill & seal joints in leaking guttering, downpipes, pipework, drains, windows, roofs and other leaking areas. Stop leaks gap filling properties make it perfect for the sealing of leaking joints, that have become loose due to weather and corrosion. Available in Black, White and Clear Finish.