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Like all said on the stop leak.I carry it when on a long trip as a just in case-limp home measure.
It probably works best when the hole is in metal-like an old beat up radiator in an old motor you plan to switch out soon.

I had just the sort of leak you describe-it was leaking toward to back-to the outside-dripping backwards.

Don't delay too long on the repair-check your oil and coolant frequently if you delay-look for cloudy "stuff"
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