I would try epoxy, it will seal most items.
weld it with nylon rod using iron plastic welder.
Replace the radiator. It is plastic and cannot be repaired.
I've heard of people gluing radiators with epoxy, and there is no technical reason not to if the area is thoroughly cleaned . Heat is good for epoxy and makes the bond stronger.
you don't repair a radiator overflow jug as they are usually plastic. Buy a new or used one from a sslvage yard.
Replace the radiator
In order to repair a broken bumber, you should apply an adhesive to the plastic and let it sit. Then use a plastic welder to mold the plastic back together. If it is just a dent in the bumper, you can use heat and hammer to press the pop back out.
No. Over the years, being a mechanic, I've tried every imaginable attempt at repairing the plastic and nothing has held. REPLACE THE RADIATOR. Usually radiator shops have the best prices.
The plastic tank on the side of the radiator can be replaced but it would be quicker and cheaper to just install a new radiator.
I had 2" crack on top of the radiator. I tried JB Weld and other similar putty but they did not work on plastic. I bought Permatex PermaPoxy™ 5 Minute Plastic Weld from Advanced Auto Parts for $7. It took 10 minutes to finish the job and it worked.
Maybe for a limited time. Weather will erode the adhesive fairly soon.
The radiator is more than likely plastic and cannot be repaired ..DO NOT use any of those quick fix things like the radiator repair crud .. just take it like a man and replace the radiator............
Here is advice: * The best thing to do it to take the radiator to a repair shop and let them handle the repair. They will clean and flush it and repair any leaks. It may be almost as cheap to replace as to repair. Check on the price of a new radiator before paying for a repair. * Most modern radiators are aluminum and plastic composite. They are not economically repairable and therefore should be replaced. NEVER replace the radiator without new hose, new radiator cap and new coolant. A new thermostat is recommended. NOTE: Unless damaged, the chief cause of radiator failure is actually a blown or leaking engine head gasket allowing the cylinder pressure (80-125 PSI to leak into the radiator (max 20 PSI).