Radiator Leak

[GoodOne]

Hi everyone,

Looking for some quick advice on a leaking central heating radiator.

As shown in the attached photo (red arrow), I've got a spray/leak coming from severe rust right on the bottom corner weld near the valve connection.

A few details about my setup:

• System age: 20–30 years old.
• System type:
• Boiler: Mexico Floor Standing Boiler.

Questions:

1. Is there any sealant, epoxy putty (like J-B Weld), or leak patch product that can temporarily hold this leak for a few days while I arrange a replacement?
2. Because it's an open-vented system with a loft tank, is adding a internal leak sealer chemical (like Fernox F4 or Sentinel Leak Sealer) directly into the loft tank worth trying for a pinhole like this?
3. What is the safest way to isolate this specific radiator so I don't lose heating to the rest of the house in the meantime?

Any advice on quick temporary fixes or things to watch out for with an older open-vented system would be greatly appreciated!

Thanks!

 

[denso13]

It is best to replace, just turn off the valves at either side until you can.