OceanAddicts said..
Hi Longdog,
You have nothing to worry about in the way of the foam taking on water, the handle maintains its own enclosed box compartment.
Its seems that you may have a small crack in the handle somewhere. Leave it in the sun for a while and spray some soapy water in the handle to see if you can see any bubbling in the soap... this will indicate a crack.
SOLUTION: Drill a small hole on the ridge in the centre of the handle and let the water drain then seal the hole and potential crack/edges with black waterproof Sikaflex.
Hope this helps!
Marcel
Thanks for the suggestions Marcel! I will give them a go. I'm happiest to hear I don't have to worry about the board's core taking on water. Cheers, Matt