J-B Weld JB Weld Extremeheat (37901UK)

Description

Genuine J-B Weld · Part no. 37901UK

J-B Weld ExtremeHeat is a high-temperature repair compound for filling holes and cracks in parts that run very hot, rated up to 538°C. On a car that means exhaust manifolds and silencer boxes; around the home it also suits heat exchangers, barbecues and fireplaces.

Good to know

• Is it a glue or a filler? It is a filler first: use it to close a crack or pinhole in hot metal rather than to hold two separate parts together under load.
• How do I get it to stick to an old exhaust? Wire-brush back to sound metal, remove all rust flakes and soot, and make sure the part is cold and dry before applying; follow the curing steps on the pack before running the engine.
• When is a repair the wrong answer? If the pipe is rotten through, a flange has broken or a joint is blowing at the gasket, replace the part or gasket; filler only bridges small holes and cracks in otherwise sound metal.

Which one?

For hot parts up to 287°C in a syringe, J-B Weld High Heat (50197UK); for a leaking fuel tank or radiator rather than an exhaust, Loctite Teroson Up 120 Leak Fix (2268369).

Key features

• High-heat repair compound
• Rated up to 538°C
• Fills holes and cracks
• Exhaust manifolds and silencers
• Also grills, heat exchangers, fireplaces

Specification