Will this work to seal an internal crack in a central heating pipe? Needs to work underwater, at temperature of 80c, and around 3psi

I've used JB weld on a motorbike oil sump before it's get hotter than 80c, I found that your best to get it dry as possible put I on and then leave to set fully and it will work well as a temp fix but you will need to address the issue properly with it being a central heating system I would say it's better to replace the pipes and do it properly the first time round.

is it flexible IF used on fabrics?

I'm sorry but I really can't give you any kind of answer to that - we only used it as an epoxy weld for a cast iron sundial!! My initial reaction would be NO but that is only a guess.

can I use this to bond mild steel handle to glass oven door? Obviously it would need to be heatproof as oven heats to 250c.

If you are bonding metal to metal on the door I would be confident, but not sure by your question if you mean metal to glass ?I have used it very successfully to bond stainless steel saucepan lid handle back onto stainless steel lid, which has steam below, ie. 100cHave just read the card which states"It can withstand temperatures up to 550F when fully cured.A full cure is reached in 15-24 hours "It is an excellent product, so I would feel confident. Best wishes, CVN.

repair pin hole on cast iron radiator

As long as the radiator is drained and the pin hole is perfectly dry J-B weld should do the job.Bob T.

JB Weld Original Cold-Weld 8265-SUK Steel Reinforced Epoxy - Dark Grey (Packaging may vary)

Product ID: 47937042

Details

Brand
J-B Weld
Item form
Gel Liquid
Material
Steel
Special feature
Strong
Specific uses for product
Craft

⏳4-6 hours set time

🔥Withstands up to 550°F

⚙️3960 PSI tensile strength

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VT4217

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Description

⚡ Fix it once, fix it forever with J-B Weld!

FAST TRACK REPAIRS - Set in just 4-6 hours so you’re back in action faster.
DIY PROVEN RELIABILITY - Trusted by thousands with a 4.6-star rating for professional-grade results.
HEAT RESISTANT DURABILITY - Handles extreme temps up to 550°F without breaking a sweat.
VERSATILE SURFACE COMPATIBILITY - Bonds metal, wood, plastic, ceramic, and more for all your projects.
UNMATCHED STRENGTH STEEL REINFORCED - Experience a 3960 PSI bond that outlasts the rest.

J-B Weld Original Steel Reinforced Epoxy is a high-strength, two-part adhesive that cures in 4-6 hours and withstands temperatures up to 550°F. With a tensile strength of 3960 PSI, it creates permanent bonds on metal, wood, plastic, and more, making it the go-to solution for household, automotive, plumbing, marine, and craft repairs.

Specifications

ASIN	B0006O1ICE
Best Sellers Rank	228 in DIY & Tools ( See Top 100 in DIY & Tools ) 8 in Sealers
Brand	J-B Weld
Colour	Dark Grey
Compatible Material	Metal, Wood, Plastic, Polyvinyl Chloride, Concrete, Fiberglass, Ceramic, Aluminium, Wood, Brick, Cardboard
Container Type	Tube
Customer Reviews	4.6 out of 5 stars 22,774 Reviews
Full Cure Time	24 Hours
Global Trade Identification Number	00043425826558
Included Components	Glue
Item Form	Gel, Liquid
Item Package Quantity	1
Item Type Name	8265-S JB Weld Auto Weld
Item Volume	2 Fluid Ounces
Item Weight	9 g
Item form	Gel, Liquid
Manufacturer	JB WELD
Material	Steel
Model Number	8265S
Other Special Features of the Product	Strong
Special feature	Strong
Specific Uses For Product	Craft
Specific uses for product	Craft
Tensile Strength	5020 Pounds
UPC	043425700018 043425006554 434258265582 088022145435 718767917027 971473137824 700736731055 043425826558 088020712301 014444924532 635665203666
Unit Count	1.0 count
Viscosity	Bajo
Water Resistance Level	Waterproof

Reviews

K**S

Strong, Reliable, and Easy to Use!

Absolutely impressed with this epoxy! It bonds metal, wood, and other surfaces with incredible strength, and the steel-reinforced formula makes repairs long-lasting and durable. The easy two-part mixing ensures a smooth application, even for DIY projects. Perfect for home, workshop, or automotive repairs — a must-have for quick and permanent fixes. ✅ Strong and durable bonding ✅ Steel-reinforced for maximum strength ✅ Easy two-part mixing and application ✅ Ideal for DIY, home, and automotive repairs Highly recommend — a reliable epoxy that delivers professional results every time!

6.10.2025

S**L

First class product.

Durability and ease of use.

23.03.2026

C**X

Yes it works! Great easy to use,

Great stuck an old metal oil lamp. & can now use it again! Definitely works.. Great quality product..

14.11.2025

M**N

A Super Product

JB Weld is an excellent product for filling and repair work. It can be drilled and tapped, is very high strength and can stand a good amount of heat. Ive been using it for many years.

18.02.2026

S**R

Amazing bonding glue

Absolutly brilliant. Best stuff ive ever used. I brought this to stick a aluminium fishing rod rest into a aluminium window cleaning pole to make a large carp extendable landing net. Super strength. It dosent budge. Hopefully lasts. Put a bolt through the two poles for added strength. I would recommend this to anyone.

2.02.2026

K**A

Fixed this very awkward 😕 table sorted 👍👍

This is was my last resort of trying to fix a 3 legged table the metal thread had sheared off and I tried in vain to retap swap out try and come up with a fix . This fixed the problem with great success so much so I stuck all the legs I had nothing to lose at this point so I’m well happy 😆 saved me at least a hundred pounds of buying two more tables

7.03.2026

R**S

Industrial glue

Excellent glue. I recommend it.

13.04.2026

M**D

Didn't work

Bought this with high hopes after reading the reviews. Unfortunately it didn't work for my problem. I needed to attach one small piece of metal to another piece. Prepped it, followed the instructions, left it to set and thought initially it had worked. After 72 hrs I held up the pieces and they came apart fairly quickly. I'm sure it would work for other issues, just not for this one.

1.11.2025

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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VT4217

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In stock

Sold byAmazon VanuatuDelivered 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 Vanuatu.

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TrustScore 4.5 | 7,300+ reviews

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