Carbon Fiber reinforcement with Epoxy Resin is a material that is very useful in several applications.  Making a mold in one of them.

One method that can be used to accomplish this operation is to use materials known as Prepregs.

The main benefit to prepreg is that liquid resin is not present to make a mess. Most prepregs need to be oven baked for cure.  This generally allows the epoxy to resist curing until it is exposed to high heat.  These materials generally have more working time.

From Youtube  Easy Composites Ltd