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Hairline crack on plastic part of radiator where upper hose connects. on 1999 BMW 323i

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Very small amount of antifreeze leaks from crack when car runs, then stops when is turned off. Car has never overheated.
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I had the same issue, and as I fixed one crack another would appear. Best option is to replace the radiator.
I do plan on eventually replacing radiator, but can't right now. What can I use as temporary fix?
I used JB Weld and allowed it to dry overnight. The cracks I patched never leaked again. Can purchase JB Weld at Wal Mart and it is not expensive. Mix and apply like you would epoxy.