This happens to almost every undermount stainless steel sink I have ever seen. I have gotten into the habit of pointing it out to my plumbing customers before I start to do any work on or under their kitchen sinks so they can’t try to blame it on me. It seems that the counter trade just can’t come up with a good adhesive for attaching stainless steel to stone or Corian. I think, also, that they never use enough clamps — I usually see only four used — one on each side of the sink, which isn’t enough. And most times, those are loose, or have fallen out of the slots they have carved into the bottom of the counter.
There are no quick fixes because you really need to completely disassemble the plumbing, remove the sink, completely clean all of the surfaces you are going to appply adhesive to, then, if possible, add more sink clamps. Just hope that the left and right sides of your sink don’t extend beyond the sides of your sink base into the adjacent cabinets, causing you great difficulty in removing and replacing the clamps and getting the sink out.
You are very fortunate to have the offer of advice from a professional like mbcabinetmaker. I would take him up on his offer.
Bruce
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2016 Rockwood Windjammer 3029W Diamond Edition
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW
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