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.

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

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

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

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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

Product ID: 48015164

Details

Brand
J-B Weld
Item form
Paste
Material
Metal Aluminum
Special feature
Resistance to
Specific uses for product
[Exhaust Heat

⏳Full cure in 24 hours

🔥Withstands up to 538°C (1000°F) heat

🛠️Drillable, machinable & sandable filler

€ 26.39

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Description

🔥 Fix the heat, own the street!

TRUSTED QUALITY - Made in the USA with a proven formula boasting thousands of 5-star reviews—join the elite fixers.
DURABLE WORKABLE - Cures solid in 24 hours and can be drilled, machined, or sanded to match your project specs.
VERSATILE APPLICATION - Ideal for exhaust manifolds, mufflers, grills, fireplaces, and more—your all-in-one heat fix.
EXTREME HEAT RESISTANCE - Engineered to endure scorching temperatures up to 538°C, perfect for high-heat repairs.
PRECISION REPAIR FILLER - Seamlessly fills cracks, holes, and gaps in metal surfaces for a flawless finish.

J-B Weld 37901 ExtremeHeat is a high-temperature resistant metallic paste designed to withstand up to 538°C (1000°F). This 3 oz grey paste cures in 24 hours into a durable, drillable, and machinable filler ideal for repairing cracks and holes in metal surfaces such as exhaust manifolds, mufflers, grills, and fireplaces. Made in the USA, it offers professional-grade performance trusted by thousands.

Specifications

ASIN	B01IBOBY74
Best Sellers Rank	3,768 in DIY & Tools ( See Top 100 in DIY & Tools ) 2 in Solder Pastes 2,231 in Home Care & Cleaning
Brand	J-B Weld
Colour	Gray
Compatible Material	Metal
Container Type	Tube
Country Of Origin	USA
Customer Reviews	4.2 4.2 out of 5 stars (11,997)
Full Cure Time	24 Hours
Global Trade Identification Number	00043425379016
Included Components	Metallic Paste Repair Bottle 3 oz.
Item Form	Paste
Item Package Quantity	1
Item Type Name	ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz
Item Volume	3 Fluid Ounces
Item Weight	86 g
Manufacturer	JBWeld
Manufacturer Part Number	37901UK
Material	Metal, Aluminum
Model Number	37901
Number of Pieces	1
Other Special Features of the Product	Resistance to extreme temperatures and ability to repair and fill metal surfaces
Specific Uses For Product	[Exhaust Manifolds, Heat Exchangers, Mufflers, Outdoor Grills, Fireplaces, Automotive Pipe Sealers]
UPC	043425379016
Unit Count	85.2 gram
Viscosity Level	High
Water Resistance Level	Not Water Resistant

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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€ 26.39

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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