Why would it not absorb water? Epoxy is not water proof, water
resistant yes, proof, no.

I'm not leaving it in the water. It is going to be stored on land.
Both ends swill be plugged. You can argue the ideal possibilities all
day but its basically doing a wood/fiberglass composite structure
using bamboo. Bamboo is a very strong natural structure and I am
using a pole much wider than recommended to increase strength even
more. You and Bruce don't have to sail on it. I need it light weight
to go faster and get better handling characterisitcs. Why do you care
so much? Have you ever tried it? Are you invested in my project in
some way? Why not just say 'good luck and let me know if it works
out'?