> Considering how many items are made with polyester resin and glass, (and
> have been made with these materials for many decades) this is unlikely.
> There is some truth in the opposite, though. Perhaps you got them
> reversed?

> Epoxy is the best choice right now for strip built kayaks, canoes and
> similar boats because it works well with red cedar and redwood. It also
> has the desirable property of sealing the wood (one company calls this
> 'encapsulation') so that water and water vapor cannot penetrate and
> promote rot.

> Polyester resin and damp wood do not make a good combination. As I
> understand it, the trapped moisture promotes delamination over time.

> Hope this helps

> Paul G. Jacobson

If you store the boat under a roof You won't have any problems with moisture. There are big sail boats made of polyester and balsa wood as distans material. And they are in the water all summer or even the hole year.