I found a great video demonstrating the repair of a carbon fiber composite panel.  The is is a carbon fiber reinforce epoxy structure that needs a localized repair to the core material.  This repair uses a vacuum bagging process to help maintain a high-quality laminate.

The video is sped up to quickly demonstrate the overall process required.  This  process requires a high level of attention to details, as they are very important.  Training and experience are necessary for good results.

Chemical adhesion between all of these layers will create a bond that is durable and suitable for restoring strength back to the structure.