I'm new and just getting into carbon fiber work. I did my first mold and ended up with little success. My carbon fiber ended up gluing to my mold. This time i put 4 heavy coats of pva release agent to try and avoid this. What I really want to find out is making split moulds. Many of the parts i want to produce carbon fiber copies of have plastic parts on the back. Was thinking of 3d printing these and gluing them on or a split mold of some sort. any advice is welcomed.

traces of PVA on the part is fine, it just washes off.  The raised parts look like classic bridging where the fabric has not been pressed fully into the corners thus leaving a void.  Sometimes this fills with resin, otherwise it stays as an air void which looks a lot worse.  You need to take more care with placing the fabric into the mould to ensure there is no bridging.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

When I was pressing it down, it was like an air pocket that wouldn't go away. No matter how much i pressed it down it would lift up on the other side. Any advice to avoid this?