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Bathroom sinks come in a few typical varieties. The cheapest is enameled steel, but that wouldn't look like cement from the underside, and the same can be said for fiberglass and solid surfacing. Cultured marble looks like cement from the underside, but their color is typically through and through, unless it is the ultra cheapo gel-coated variety. It wouldn't be vitreous china,so that leaves porcelain on cast iron, which has a very rough texture to the underside. Knock it with your knuckle-if it's cast iron, you'll note the weight and density, and probably curse at me if you've split your knuckle. There are repair kits for chipped porcelain, but they usually don't last really well. Some companies will chemically etch the sink and recoat it to whatever color you want. I've used those guys when doing a bathroom remodel with a new commode and sink when I want the tub to match without the expense and hassle of a tear-out. For DIY-go to your local professional paint store (MAB, Benjamin-Moore, Pratt & Lambert) and ask the paint guy what he recommends. Perhaps a catylized epoxy would be easy enough for you to use and sufficiently durable.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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