This product is the J-B Weld Tiger Patch Kit (39206), designed for repairing exhaust pipes, mufflers, and tailpipes.The kit includes a fiberglass wrap coated with a heat-activated epoxy and a piece of aluminum tape for securing the patch.It cures in 20 minutes with heat from the engine and can withstand temperatures up to 600°F (315°C).The patch hardens like steel to permanently seal cracks, holes, and leaks without requiring welding or clamps.