If it keeps leaking like that then it could well just be too much corrosion and radweld can no longer seal it.
Be careful - it might just "go" one day soonish.
If you have an iffy rad and need to drive the motor urgently, leave the pressure cap off. The leak may not be present if the system is not pressurised. Equally check for leaks when coolant hot as some are blatantly obvious in this state (but obviously hot = burn so be careful ).
Pete
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