Unfortunately the repair in my case did not last and another crack developed alongside the weld. When I removed the radiator a second time the top connection tube broke up along the edge showing that the plastic had deteriorated over time and with heat. Sadly I can no longer recommend welding as a fix.
As mentioned in another post, I have since had an alluminium top tank fabricated and fitted by a local radiator shop, one of several, here in Aucklnad New Zealand, who offer this service,. My radiator is now better than new.
It has surprised me that this option has not been taken up in your part of the world, given the prices quoted for new radiators. The tank replacement cost me, in your money, approximately $150-00.
