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Won't be polyethylene or polyprop which are both low melting point and quite oily plastics hence very difficult to glue.  It's probably glass re-inforced nylon.  As a temporary repair I would use a plastics epoxy eg Unibond 1381190 Repair Power Epoxy for plastic.  You might find the repair outlives the rad but I wouldn't rely on that. Clean the joint with meths beforehand.

Thanks for your replies, I already have a replacement, I was just trying to put off doing it as I need the car a lot at the moment, plus something is bound to go wrong!

If you count the time needed for any adhesive(that might work) to set, changing the radiator will be quicker.

Boat people - tow the boats back to France and drop them off.
If the French want a fight over it, well they need to remember history.

Young Brits who think the country owes them a living without them having to get out of bed - starve them into a job.
If they claim to be disabled. Tell them Stephen Hawking was the most disabled person you could ever see, and he worked all his life.
99% of people are capable of doing something.

Gets my vote. The French are just operating a taxi service. They should be questioning the prospective ( now punctured) boat people and bussing them back to the EU country they arrived in.for asylum processing. Imagine the Frogs if boat people arrived in the UK and gangs smuggled them to France. I wonder what their response would be.

It would certainly be a much more robust response than our useless spineless political and governing classes can muster. 

At the very least they would demand that Britain take back all illegal immigrants that arrived by dinghy from England, and I've little doubt that the UK Govt would agree to do it without so much as a whimper. 

I've seen the occasional report of the odd migrant trying to get back to France when they find life in Britain is not for them, only to be caught and stopped by the British authorities.    I think one stole a canoe and tried to paddle back to France. 

Boat people - tow the boats back to France and drop them off.
If the French want a fight over it, well they need to remember history.

Young Brits who think the country owes them a living without them having to get out of bed - starve them into a job.
If they claim to be disabled. Tell them Stephen Hawking was the most disabled person you could ever see, and he worked all his life.
99% of people are capable of doing something.

Gets my vote. The French are just operating a taxi service. They should be questioning the prospective ( now punctured) boat people and bussing them back to the EU country they arrived in.for asylum processing. Imagine the Frogs if boat people arrived in the UK and gangs smuggled them to France. I wonder what their response would be.

Thanks for your replies, I already have a replacement, I was just trying to put off doing it as I need the car a lot at the moment, plus something is bound to go wrong!

I bet it goes like a stabbed rat. 
Power to weight ratio should be pretty impressive. 

Boat people - tow the boats back to France and drop them off.
If the French want a fight over it, well they need to remember history.

Young Brits who think the country owes them a living without them having to get out of bed - starve them into a job.
If they claim to be disabled. Tell them Stephen Hawking was the most disabled person you could ever see, and he worked all his life.
99% of people are capable of doing something.

plastics are notoriously difficult to glue, and that's before they've had twenty years of heat cycles and chemicals flowing through them.


When a brand new radiator is about £100****, gluing one should really be considered nothing more than a get-you-home lash-up


**** Or much less; LINK

From an article in today's Telegraph by Daniel Hannan.

Consider, one more time, some of the statistics.

Around 3,000 people a day are signed off as too sick to work. The total number of claimants is forecast by the government to go from 3.3 million to 4.1 million by the end of this parliament.

According to the NHS Confederation, in 2021-22, 63,392 people went straight from university onto long-term sickness benefits.

The fastest rise is among 25- to 34-year-olds, an incredible increase of 69 per cent in five years. (Incredible in every sense: such a sudden and cataclysmic explosion in disability would surely be visible on the streets.)

In Birmingham, one in four working-age adults is inactive. One. In. Four. Even at the height of the Great Depression, the proportion in our second city never rose so high. Then, mass worklessness was treated as the most important challenge facing the nation; now, we barely notice.

https://www.telegraph.co.uk/news/2025/07/12/reform-welfare-or-failed-state-britain-only-choice/

Ah, Sir Tigger, you have now got to the hub of the issue

It is not just the small boat issue, but a far, far bigger challenge;  the issue of what “our own” people are up to. Not a lot many would argue!.  Just look at the NHS.  It is run by very good people originally from abroad.  When I was in hospital all staff were from across the planet!  The doctors, nurses, porters, down to the cleaners.

Then I was in my dentists the other day, where all the medical staff were from Asia and other foreign lands.  Only the receptionists were orginally from Britain!

Then, of course, the regular one is the nail bars and car wash outlets; all run by those from all over the World.

Then there is the Amazon delivery staff, who are all of a “foreign” background, almost without exception!

So where are our youngsters?  Obviously many are actively in work, but as the figures suggest so many are just on their backsides, making excuses why they are not fit to work and taking welfare payments.  50 to 60 years ago that was not the case as we left school knowing we had to work. We had the work ethic drummed into us by our parents.  What the fk is happening now?!!

No, it is not the boat people we should be worrying about, but our own!!

Now I could get very politically right wing, but I will leave that to others

as a quick "get you home type fix" you could melt the crack with a small soldering iron and maybee overcoat with jb weld or similar but it probably won't last long term and new rads are not that expensive .