Well, it depends on the source of the leak. Usually, radiator leaks come from the radiator fabric, the valve, spindle, pipework, etc. If corrosion made a hole into the radiator body, whatever temporary measures you take, you would need to replace it. But if the issue comes from the valve, it can probably be fixed. So, whenever you notice a warning sign, we recommend calling an accredited technician to identify the cause and deal with the leak quickly.