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.

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

UNMATCHED STRENGTH - 3960 PSI tensile strength for rock-solid repairs
HEAT RESISTANT BOND - Endures extreme temperatures up to 550°F without breaking down
VERSATILE APPLICATION - Perfect for metal, automotive, plumbing, marine, and creative projects
RAPID SET LASTING CURE - Sets in 4-6 hours, fully cures in 24 for quick project turnaround
SHAPE FINISH FRIENDLY - Can be shaped, sanded, drilled, and filed post-cure for seamless integration

J-B Weld Original Cold-Weld 8265-SUK is a two-part steel reinforced epoxy that creates a permanent, dark grey bond with 3960 PSI tensile strength. It sets in 4-6 hours and fully cures within 24 hours, resisting temperatures up to 550°F. Ideal for durable repairs across metal, automotive, plumbing, marine, and craft applications.

Reviews

P**T

Jb weld chemical metal 2 tubes

The original jb weld, awesome product, gets you out of the proverbial many times, sets hard within 10mins, if you have used it you know its strength and capabilitys, just buy a pack just in case, you strip a sump plug thread!!

24.08.2025

D**S

Good product

Good product, works well

15.09.2025

E**F

Seems good

So far seems good

23.08.2025

A**N

Amazing product, very solid bond

This stuff is amazing. I only purchased it for a temporary fix to a leaking exhaust pipe and muffler for the MOT. In fact it outlasted the exhaust which eventually rotted, but this was still solid and attached. It sets solid and bonds well, seems stronger than epoxy. Mixes easily without much effort. I purchased another pack for emergencies.

18.07.2025

T**N

Quick fix

Brilliant for a quick fix easy to apply

31.07.2025

A**V

Very strong, takes 24 hrs to set.

Takes a while set but when it does it’s extremely strong!

27.08.2025

B**B

Great product

Great product - have used this stuff before - ideal for small repairs - fast delivery from supplier - Many Thanks

2.08.2025

K**R

Product fine, great price, communication could be better

This item was advertised at a very low price, after ordering I received an email saying it was no longer available. I was disappointed and wrote a negative review of the seller. The procuct has now been deliverd. Delivery time was slow but the product is fine and much cheaper that the same product form other sellers.

5.08.2025

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TrustScore 4.5 | 7,300+ reviews

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Manufacturer	JB WELD
Brand	J-B Weld
Model	JB8265-S
Product Dimensions	0.76 x 12.7 x 20.32 cm; 9.07 g
Item model number	8265S
Manufacturer part number	8265S
OEM Part Number	20-1623
Special Features	Strong
Item Weight	9.07 g
Viscosity	Bajo

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

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