: In addition to Jay's comments

If you prefer not to fill your boat with water and hoik it about
and do your back in, try getting the inside very dry, then taping
some kitchen roll inside the hatch, closing the hatch and giving
it hell with a hose pipe or even a pressure washer.

Carefully dry outside the hatch before opening - the wet patch on
the kitchen roll will show exactly where the leak is. The same test on
my leaking aft Kajak-sport hatch (very similar design to the VCP, but
a smaller size) showed the leak was actually in the hull-to-deck
seam. As Jay says, leaks in these types of hatches are almost unheard
of.

If it really is a leak in the VCP hatch, you could try replacing the cover
with a new one - there may be some small manufacturing defect in the
original cover. Or you could get the VCP stainless steel compression
band to go round the hatch cover, which makes the seal even more
bombproof.

Andy