You could try an epoxy pour similar to this:
http://forum.cruisingworld.com/forum...pl?read=381390

Paul
www.jcruiser.org
"engsol" wrote in message
...
Now that I have a boat, I need to replace a couple of
gate valves used as seacocks.

Nigel Calder et all recommend using a wood block and bronze
bolts to secure the seacock to the hull, rather then simply
screwing it to the through hull. Makes sense to me.

The diagrams all show a perfectly flat hull, but as we all know,
real hulls are generally curved. My question is: what's the
best way to contour the wood block (actually a ring) to conform
to the hull? Any hints?

Thanks, Norm B