2cv
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Without knowing the circumstances of this application, I doubt anyone could advise. However, there is a generic "correct" sealant.
What I'd use is some form of non-setting butyl sealant: the stuff that's like sticky blutac, but white. It comes on a roll with a backing release paper. Quite expensive, but it lasts for decades without going hard, getting stiff or cracking.
Unfortunately I don't remember what its brand name is.
Remember, you are looking for a sealant, not an adhesive. You want it to stay flexible and waterproof forever.
Many thanks. Now that I've cleaned it up I’m beginning to wonder if it actually needs attention.