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.

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TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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

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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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