Poly glycol and silicon make it so the resin will not bind to the fibers. This is how Kevlar and the other composites become ballistic and or cut resistant. The materil becomes essentialy a net that slowly defoms and catches the projectiles, where stiff material fracture quickly and therfore dispate very little of the energy.

A hull needs to be stiff. Adding a binder inhibitor to it would not only make it structuraly unsound, but the thin skin would be in effect even less resistant to denting the core.