i have a rod with a carbon fiber grip,built with riley rods materials as well,and in my experience it doesn't slip my hand when wet. Octavio.
I put one of Dicks grips on a fiberglass rod and I was really suprised on how much grip it had, not slick at all.
I have yet to have any complaints about grips being slick when wet. They actually seem to get grippier as they get wet.