Hairline cracks in Kohler cast iron kitchen sink
Our Kohler kitchen sink began developing hairline cracks. At first they were nearly invisible, but now rust has begun to seep up and discolor the cracks. Over time, the porcelain adjacent to the cracks has begun to lift. The sink was installed by the builder of our new home. Kohler says it won't cover the cracks under its warranty. They say something was dropped in the sink even though the cracks follow the curved contours of the sink in an area that would be difficult to drop something on. Has anyone had this problem? The cracks are growing over time, and from what I've read it's not possible to repair cast iron sinks.