New answers tagged sink
According to your model number it is a Kohler self rimming, surely made for drop in, not undermount
Undermounts are missing a mounting rail and brackets to hold it from shifting. If you've got 1" or more of counter under the lip of the sink, you can embed it in waterproof adhesive-caulk. It won't be fun to remove, but epoxied undermounts aren't fun to remove either.
If the "time period" aspect is important enough, there are places where you can send your sink for a proper repair/refinish (if it's possible - hard to say for certain without knowing more about it) - they will advertise more (if at all) for the cast-iron tub trade. It will cost more than a new sink, most of the time. A DIY filler/paint job has odds of ...
It is also a bad design because any water that gets in there pools. For that reason I would "glue" it on with a basic latex caulk. When you need to service the tap you'll have to cut out the caulk.
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