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J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz, Grey

J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz, Grey

Q: i have a small hole in my woodburning boiler in the firebox . will it plug it?

I had a crack next to the chimney connection. I used this to fill it. Repainted the whole stove black. You couldn’t see where the repair was. Lasted years and was still ok when we moved last year.

Q: There is a small chip in my oven which exposes a metal base. Could I use this to fill the chip which is about the size of thumb nail. Thanks

As long as you can clean any dust and dirt off first i don't see why not

Q: Will it seal a hair line crack in water pipe inside a heat exchanger of a domestic boiler ( temperature very high) ?

I would guess so as this is used for exhaust manifolds which get very hot ..not sure if waterproof though

Q: Can this be used to seal around exhaust tail pipe

Yea..I used this to seal a flange join on my EGR exhaust pipe and worked well

Product ID: 48015164

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Details

Brand
J-B Weld
Specific uses for product
['Repair'
Material
Dough
Item form
Paste
Special feature
Heat Resistant

⏳Fast 1-hour set time

🔥Withstands up to 538°C

🛠️High-viscosity filler for cracks

Frequently Bought Together

J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz

J-B Weld ExhaustWeld 2" x 72" Repair Wrap, White

J-B Weld High Heat Epoxy Syringe, Dark Grey

Description

🔥 Seal the heat, own the street!

COMPACT READY TO USE - 3 oz tube with easy application, designed for professionals who demand efficiency.
PRECISION FILLER FORMULA - High-viscosity metallic paste fills holes and cracks seamlessly for lasting repairs.
RAPID SET RELIABLE CURE - Sets in just 1 hour and fully cures within 24 hours, minimizing downtime.
UNMATCHED HEAT RESISTANCE - Engineered to endure scorching temperatures up to 538°C, perfect for extreme conditions.
VERSATILE INDUSTRIAL STRENGTH - Ideal for exhaust manifolds, heat exchangers, mufflers, grills, and fireplaces.

The 37901 ExtremeHeat Metallic Paste by J-B Weld is a high-viscosity, heat-resistant filler designed to withstand temperatures up to 538°C. Perfect for repairing exhaust systems, grills, and fireplaces, it sets in 1 hour and cures fully in 24 hours, delivering durable, professional-grade repairs in a compact 3 oz package.

Specifications

Manufacturer	JBWeld
Brand	J-B Weld
Model	ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz
Product Dimensions	4 x 4 x 5.2 cm; 86.18 g
Item model number	37901
Manufacturer part number	37901UK
Special Features	Heat Resistant
Item Weight	86.2 g
Viscosity	High

Have a Question? See What Others Asked

i have a small hole in my woodburning boiler in the firebox . will it plug it?

There is a small chip in my oven which exposes a metal base. Could I use this to fill the chip which is about the size of thumb nail. Thanks

Will it seal a hair line crack in water pipe inside a heat exchanger of a domestic boiler ( temperature very high) ?

Can this be used to seal around exhaust tail pipe

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