Although I don't really know what caulking Jayco used on your trailer, I'd like to float an idea. In my trailer, Jayco set the kitchen and bathroom sinks into a putty like material. Over time, that putty material squeezes out. If this is the case with your sink, you might consider using a plastic scraper - which you could get in the paint department at a home store - and scrape off the excess putty.
I did this for our kitchen sink, and then caulked around it with a white silicone caulk. The silicone would probably keep the putty under control, and would end the stickiness.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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