How can I fix a leaking cement laundry tub? I don't want a plastic tub
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You can repair it- this article should help you get started! https://www.hunker.com/12266879/how-to-repair-a-concrete-sink
Flex sealsold in stores
The Mighty Putty stuff that's sold in stores and on TV does not hold up well to water repairs. I used it to fix a pipe on my pond fountain and it chipped off over a short period of time. I wouldn't recommend it for repairing a sink.
I've not tried the Flex Seal, but have read better reviews about that product.