I finished glassing my NH hybird and am now getting ready to complete my boat. Sand, sand, sand, etc.  I bought the hidden hatch kit but am thinking about not even cutting hatches. I bought Miniscule (sp?) foam for the bulkheads and will put those in place. My concern is if I do a roll, or otherwise get water in the cockpit, it will leach fore and aft underneath the foam unless I have  a really good seal.  Not having hatch access I will be unable to get any standing water out. I wanted to get some advice how to best seal the foam bulkheads so that will not be a problem. Thanks. Mark