sustained damage. But neoprene for cockpit covers is rare. I used to make my own.
Not sure what you mean by "vinyl." Vinyl coated fabric?
On "leakage," with some cockpit rim well designs, changes in temperature and atmospheric pressure can cause water sitting in the rim well to be pumped under the cockpit cover bungee and into the boat. Later cockpits often have little drain channels so water doesn't sit against the bungee.
PFD's (Life Jackets)
Touring Kayak Paddles
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