JB Weld ExtremeHeat Metallic Paste 85 g, Model 37901

Model: JB Weld ExtremeHeat is a temperature-resistant metallic paste for repairs to iron, steel and metal in high-temperature settings. The listing says it is designed for temperatures up to 1000 degrees F/537 degrees C and can be drilled, machined or sanded once fully cured.

At a glance

Formulated for repairs to iron, steel and metal in high-temperature environments.
Suggested for cracks, small gaps, seam connections and holes in items such as exhaust manifolds, pipe connections, mufflers and grills.
The listing says the cured compound can be drilled, machined or sanded.
Described as water based, non-flammable and free of solvents and VOCs.

Price

$24.53Save 15%

Reference price: ~~$28.95~~

Price checked: 13 Nov 2026

View offer

Often bought together

JB Weld Original Cold Weld Formula Steel Rainforced Epoxy Twin Tube, 56 g

$23.00

Pros and cons

Pros

Paste format is suited to filling cracks, small gaps, seams and holes.
The listing describes post-cure machining options, including drilling, sanding and machining.
The product is presented for a range of metal repair contexts, from exhaust components to grills and furnaces.

Technical specifications

11 specifications

Identity
Brand	JB Weld
Model	37901
Item form	Paste
Number of items	1

Use and curing
Full cure time	24 Hours
Surface recommendation	Metal, Pipe
Temperature range	1E+3 Degrees Fahrenheit

Dimensions and installation
Weight listed	0.08 Kilograms

Materials and protection
Water resistance listed	Water Resistant
Material type	Metal
Colour	Multicolor

What to know before buying

Listing details to confirm

The temperature claim is supplied as 1E+3 Degrees Fahrenheit in the technical details, while the description states 1000 degrees F/537 degrees C. Treat this as a claimed rating, not an independently confirmed performance limit, and check suitability for the specific repair and operating conditions. The stated 24-hour full cure time should be allowed for before relying on the repair.

What’s in the box

Included

1 x JB Weld ExtremeHeat Temperature Resistant Metallic Paste, 85 g

Who is it for?

A good fit for

People repairing cracks, small gaps, seams or holes in iron, steel or metal parts exposed to high temperatures.
DIY users considering repairs to exhaust components, grills, fire boxes, furnaces or water heaters, where the listed surface and temperature suitability matches the application.

Less suited to

Buyers who need an independently verified temperature rating or application-specific performance data.
Repairs where the stated 24-hour full cure time cannot be accommodated.

JB Weld ExtremeHeat Metallic Paste 85 g, Model 37901 · photo 2 — Additional product photo 2

Customer reviews on Amazon

3.3 / 5 · 10 ratings

5 stars46%46%
4 stars0%0%
3 stars23%23%
2 stars0%0%
1 star31%31%

Aggregate customer ratings are mixed, with ratings distributed between five-star, three-star and one-star categories. The small rating sample does not show what drove those views, so it cannot establish how well the paste performs in a particular repair. Buyers should weigh that uncertainty against the listed metal-repair uses and 24-hour cure time.

Frequently asked questions

What temperature does JB Weld ExtremeHeat claim to withstand?

The technical details give 1E+3 Degrees Fahrenheit, while the product description states 1000 degrees F/537 degrees C. These are listing claims rather than independently verified limits, so confirm suitability for the intended repair.

How long does the paste take to fully cure?

The listed full cure time is 24 Hours.

Can the cured paste be worked after curing?

The listing says the fully cured compound can be drilled, machined or sanded.

What repairs is this paste intended for?

The listing describes repairs to iron, steel and metal, including cracks, small gaps, seams or holes in items such as exhaust manifolds, pipes, mufflers, grills and furnaces.