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It just get used when unnecessary, the standard stick some silicone on it theory (skirting to floor, any joining surface in a bathroom, window frames etc), and it's a ballache to remove and definitely not paintable
[When @mespilus does input on sealants it usually gives me a few days research, One Part Polysulphide silicone, being the last]
I'd trust what they've left you
Bugger,, probably silicon, but the last thing to do