J-B Weld Extreme Heat High Temperature Resistant Metallic Paste J-B Weld Extreme Heat is formulated to allow for repairs to iron steel and metal in high temperature environments (2400°F / 1300°C). When fully cured this metallic compound can be drilled machined or sanded. It is great for repairing cracks small gaps seam connections or holes in exhaust manifolds pipe connections mufflers catalytic converters outdoor grills fire boxes gas and commercial furnaces and water heaters. This product is water based non-flammable and contains no solvents or Volatile Organic Compounds (VOCs). Great for: Exhaust Manifolds Tailpipes Mufflers Engine Blocks Duct Work Heat Exchange Units Fire Box / Fire Place Outdoor Grills Use on: Automotive Metal Specialty Products And More Instructions 1. Prepare: Remove dirt debris or loose contam