Remove drain and fill the seam with a urethane like dymond which will hold up well in wet areas. (we have it)
Then sand it smooth and refinish to honed or polished surface
You will need some flexible pad drivers so you can follow the contour

On Wed, Apr 6, 2016 at 8:41 PM, Justin Cameron <justin@jmcstoneandtilecare.com> wrote:
Wondering how you guys restore inside marble sinks. These are a little ruff just getting ideas.
Thank you

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Regards,
Stu Rosen
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"EVERYTHING MATTERS"