Years ago I lived in an extremely old apartment building in Brooklyn. The bathroom tile (formerly white) was yellowed with very old, dirty grout. I washed it down then applied a product called "liquid sandpaper". When fully dry, I painted as usual. It never peeled and looked beautiful for years despite the fact that I took many steaming hot showers.
However, spurred on by this success I tackled the old kitchen sink with an Epoxy/Ceramic kit. Followed instructions perfectly and then left for a 1-week vacation so that it would be totally dried. The first time I filled the sink with water, the paint bubbled all along the water line. It took me weeks to peel off all the remnants of that process and my sink looked worse than ever. Eventually I bit the bullet and replaced the sink.
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