restoring very old butler sink?

i discovered a butler sink in my garden yesturday. it took an hour to dig it out! its in a bad way alot of the ceramic has come away revealing the stone underneath.

it definatley cant be used for anything other than a garden planter, but just wondering if there is anyway i can restore it a bit. cheaply!! i wont be able to get it re enamled, so was l thinking maybe i could paint over it with some kind of outside stone paint (if it exists!) what would you do to it?

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