●It is water-soluble so you can apply water and shape it. Just push your finger into the repair area, no tools needed ●[Features] This is a professional muffler repair putty that is hardest to use when holes and cracks are formed in a car scarf. Gungum is a thermoset putty that hardens with exhaust heat to prevent gas leakage ●[Uses] Repair mufflers, muffler pipes, holes and cracks in exhaust manifolds. Repair the heating part of the boiler/stove. For cracks: Width: 0.2 inches (0.5 cm), Length: 2.8 - 3.1 inches (7 - 8 cm); For Holes: For holes within 0.4 inches (1 cm); Quality Display: Working Temperature: 24.0 - 88.1 inches (10 - 30 °C); Color: Gray, Compatible Material: Inorganic binder salt) ●(Set Contents) Gunham 7.1 oz (200 g); Instruction manual (English language not guaranteed) ●For repairing rust holes and cracks from silencers. Will not peel off even at high temperatures, just roll it up for easy repair ●[Features] When you have holes or cracks on your car muffler or silencer, simply stick it on with a strong adhesive. This aluminum tape can also be used for putty applications ●[Uses] Repair holes and cracks on main pipes. Holes and cracks in the silencer part; Use as a protective tape for hoses and harnesses in the engine compartment ●[Specifications]; Working temperature: 24 - 88°F (10 - 30°C); Compatible materials: Iron, non-ferrous metals; Thickness: 50 microns; Heat resistance: -50 - 310 °C