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How do I keep an old sink looking clean?
A kitchen sink is just about the most brutal environment in a house. Just think of how much abuse these areas take. I would be very concerned about any paint or coating holding up here. I hate to say it but you might want to look at replacing it with a porcelain or stainless steel sink. By the time you painted it with a epoxy (about the only thing that might work) you could have pulled it and replaced the sink.