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I've seen concrete counter tops and really like them but have no idea how they are made. Was the plan to press the mold into the concrete (male mold) to make the sink?
I've played around with concrete some and found that buoyancy tends to push the molds up so they float on top. When you try to hold the mold down in place it tends to deform the mold unless it's really stiff. Otherwise you can fill the mold with something just as dense as the concrete.
You could just pour concrete in the sink and make a concrete mold, paint it and apply mold release, but your out of luck if it won't come out of the sink and you might need room for an engine hoist in the kitchen, 'cause it'll be heavy (cast a hook in). Still have to be careful about air bubbles, but may be able to touch it up.
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