Hi there,
Besides knives, I have another hobbies and among them is the making of wooden spearguns. Sometimes I laminate CF fabric in between the wood pieces to add ridgidity and prevent warping. One of my last ones was also fully wrapped in CF vía vacum bagging. I learnt a lot during the process. I use a three ply material on top of the CF (peel ply, breather and wicking material). Once the piece is bagged, vacumed and cured, you remove the last two layers and leave the peel ply. It is meant to stay on the piece untill right before you add another layer of CF for a very good reason.
Epoxy coats (or CF layers with epoxy) addhere to the previous one via two mechanisms. The first one is chemical adhesion, it takes place when the first coat is not fully cured. This is the strongest mechanism. The other kind of adhesion is mechanical, and for it to happen, you need a textured surface. The rougher (to some extent), the better.
When you use more than one layer of CF to wrap a piece, you usually sand in betwen them to remove imperfections. To sand properly you need to allow the epoxy to fully cure. That's where the peel ply comes VERY handy, because when you remove it, it leaves a neat texture on the epoxy for the next layer of CF/epoxy to adhere to. It also protects it from getting contaminated (grease). When I sand imperfections I only do it in those spots who really need it, the remaining surface of the piece is left untouched. That's exaclty what the peel ply if for.
I always aim for a smooth glossy finish to protect the CF so I use two/three epoxy top coats without allowing them to fully cure in between coats (all in a rottisiere to prevent dripping). Some makers leave the peel ply finish, it looks good as well, but does not let you put stickers on it.
I hope this helps!