Re: cap/hull separation
I would use screws that are fully engaged. I used 5200 as a bonding agent as I screwed the deck to hull together. Then let dry for at least a week. Then installed the rubrail with adequate bolting through both upper deck and hull. I did use a small amount of silicon on the rubrail as it was installed. I do not like rivets - either screw or through bolt if you can access.
ET
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