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)

🛠️Drillable, sandable & machinable cure

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Fix the heat, own the street! 🔧

TRUSTED PERFORMANCE - Backed by thousands of 4+ star reviews, a go-to for pros and DIYers who demand reliability.
DURABLE MACHINABLE - Once cured, can be drilled, sanded, and machined to match your project’s exact specs.
VERSATILE APPLICATION - Ideal for exhausts, mufflers, grills, fireplaces, and heat exchangers—your all-in-one repair solution.
PRECISION METAL FILLER - Seamlessly fills cracks, holes, and gaps in metal surfaces for a flawless finish.
EXTREME HEAT RESISTANCE - Engineered to endure scorching 538°C without breaking down, perfect for high-temp repairs.

J-B Weld 37901 ExtremeHeat is a high-temperature resistant metallic paste designed to repair and fill metal surfaces exposed to extreme heat up to 538°C (1000°F). It cures fully in 24 hours, becoming drillable, sandable, and machinable, making it ideal for exhaust manifolds, mufflers, grills, and fireplaces. Trusted by professionals and DIY enthusiasts alike, this 3 oz grey paste delivers durable, precision repairs that withstand the toughest conditions.

Specifications

ASIN	B01IBOBY74
Best Sellers Rank	3,244 in DIY & Tools ( See Top 100 in DIY & Tools ) 2 in Solder Pastes 1,986 in Home Care & Cleaning
Brand	J-B Weld
Colour	Gray
Compatible Material	Metal
Container Type	Tube
Country Of Origin	USA
Customer Reviews	4.1 4.1 out of 5 stars (11,742)
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
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 043425700285
Unit Count	85.2 gram
Viscosity Level	High
Water Resistance Level	Not Water Resistant

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