J-b Weld 37901 High Temp Muffler Cement Paste

Product Description

The J-B WELD 37901 is a metallic repair paste formulated for high-temperature applications where standard adhesives and sealants fail. Rated for continuous heat exposure up to 1000 degrees F, this cement paste bonds and seals metal components exposed to extreme thermal cycling. It is used primarily on exhaust systems, mufflers, and other heat-intensive assemblies. HVAC technicians, exhaust system fabricators, and experienced DIYers working on flue and venting components rely on this type of product to make durable, heat-resistant repairs without full component replacement.

This paste is suited for residential and commercial applications involving exhaust components, mufflers, tail pipes, manifolds, and flue connections subject to repeated high-heat exposure. It applies directly to metal surfaces and cures to a rigid, heat-stable bond. Typical use cases include sealing cracks, gaps, or joints in exhaust and venting assemblies where weld repair is impractical in the field.

Key Features

• Withstands continuous heat up to 1000 degrees F
• Metallic paste formulation for direct application to metal surfaces
• Designed for exhaust, muffler, and high-temp flue repair
• Field-applicable without specialized equipment
• Sets to a rigid, heat-stable bond after cure

Compatibility

Designed as an OEM-style repair paste for metal exhaust and muffler assemblies, flue connections, and similar high-temperature metallic components in automotive and HVAC venting applications.

Installation Notes

Application should be performed by a qualified technician familiar with exhaust or venting systems. Allow the assembly to cool completely before applying the paste, and ensure the surface is clean, dry, and free of grease or corrosion. Follow the manufacturer cure instructions before returning the system to service. Consult applicable mechanical and fuel gas codes, such as the IFGC, when using on venting components in gas appliance installations.

Technical Specifications

• Maximum Continuous Temperature Rating: 1000 degrees F
• Form Factor: Paste
• Material Type: Metallic repair compound

Standard Information

• Brand: J-B WELD
• Manufacturer Part Number: 37901