The rule for kevlar is bury it deep. It soaks up water and only forms a mechanical bond whereas carbon forms a chemical bond with the epoxy.
First I like to show you some explanation about how epoxies and polyesters do work:
epoxy and polyesters The cloth in a laminate will always suck up some water when the surface is damaged. (That's why they fill themselves with resin too)
Glass, carbon, kevlar or whatever, it makes no difference.
If the carbon molecules of the carboncloth really are bonded in the epoxy molecules during the hardening (the polymerisation), like you said, then this should mean less stable (disturbed)epoxy molecules.
The strenght of a laminate is largely determined by the fibers in the cloth you use. The resin only keeps all the fibers together; to be more precise, holds them at their fixed position to each other.
It fills the space between the fibres and fills them and holds them internally.
