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Look at CT1. They also have a product called multi solve that will clean the rest of that mastic off. It looks like it was fixed with a normal bathroom sealant when it needed something that would both seal and handle the weight.
CT1 gets used and abused in a lot of situations so I would take the reviews with a pinch of salt. The multi solve is very useful when you're cleaning old mastic residue off baths.
Sink (installed in 2001) came unstuck. What glue to use ? Silicone? I’ve scraped as much of the old stuff off as possible