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Black Jack Leak Stopper is a rubberized plastic cement for patching roof leaks on shingles, built-up roofs, SBS modified roofs and metal. Its Penetrex penetrating oil sinks into cracks while liquid rubber forms a flexible, watertight seal. It works year-round, though the surface should be between 50 and 120 F, and cold weather calls for warming the container indoors first. It is a straightforward patch-and-seal product rather than a full coating, and reinforcing with patching fabric is recommended for lasting repairs.
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Lowest price we've seen: $20.94 on Nov 12 at The Home Depot. Tracked across 10 stores since Nov 12.
Owners rate it highly and describe it as an effective, easy-to-apply leak patch that holds up on shingles and metal. A few mention application quirks in cold weather or the need for a thick layer.
Leak Stopper Rubberized Roof Patch is a black plastic cement for patching and repairing roofs. It contains Penetrex, a penetrating oil that reaches deep into cracks and forms a complete seal. Added liquid rubber makes the cement flexible and gives it a watertight bond. It is formulated for year-round use.
It works on shingles, built-up roofs, SBS modified roofs, metal roofs and many other surfaces. Work the material over and into the damaged area at about 1/8" to 1/2" thick, extending two or three inches beyond the problem area. Reinforcing the repair with a strip of Universal Patching Fabric is recommended. Embed the fabric in the cement and cover it with a second layer. Where chimneys, vent pipes and other projections meet the roof line, form a feathered edge with the cement.
Do not expose it to direct heat or flames, and do not thin it. It is best used when surface temperatures are between 50° and 120°F. In colder weather, 50°F and below, store it in a heated room at 70° to 80°F for at least 24 hours before application to make it easier to apply.
