I buy the silicone gasket material (RTV) in the big tube. I use a caulking gun to put put a bead in place of the entire end seals.
It cures as an adhesive caulking compound and is never going to ooze out or permit leaks from the corners.
The cork eventually dries, shrinks and cracks.
The neoprene needs to be caulked to seal.
Why bother. Just caulk the whole thing.
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