Wet carbon is layed up like fiberglass where dry cloth is layed on the surface and resin is then applied. It can also include vacuum bagging and autoclaving which improves strength. It could also be where the resin is drawn in from one end to the other by the vacuum in the vacuum bagging step. This is almost as good as pre-preg, and will be lighter and stronger than normal layup and resin application.

Dry carbon is prepreg, its carbon cloth with precisely controlled amounts of resin applied already. Its lighter and will be as strong as possible thanks to the exact right mix ratio of carbon and resin.