hi Mairi
On Aztec I have put mastic around the joint of the hatch cover on the coachroof to seal the gap, and the sprayhood keeps the rain off the actual hatch.
Check the trim of the boat (fore and aft) because on Aztec water tends to drain out into the cockpit, (if it got in that is)
Mike Edwards
Seal 28 "Aztec"
Mike Edwards
Seal 28 "Aztec"