The deck/hull join on the MkII and MkIII is pretty robust.
The mouldings have a good overlap to bond to each other and a 'tab' is layed up underneath when the two components are joined to add to the strength.
The deck at the bow however is slightly different and doesn't have the same overlap. A thicker tab which goes right across to the other side is layed up but it is a tricky job working upside down in a confined space. Not all joints in this area are perfect.
The toerail is bolted through the overlap and it is important to make sure the bolt hole is sealed well to stop water ingress.
At the bow however as there is no overlap in this area, the toerail is screwed into the hull/tab lap and might even penetrate into the interior of the hull. Sealing the fasteners in this area is also advised.
Finally, as the deck is not overlapped at the bow, any big impact to the bow roller/headstem fitting can crack the filler and let water into the join. Many Top Hats have had repair in this area and when replacing the toerail there is a good opportunity to inspect and repair if necessary.
Cheers,
Tom
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