Update time!
Here is the mold release and PVA I used:
It says to put 3 coats of wax on a new mold, so I put on 5 just for good measure
I then did 2 brushed on coats of PVA onto each mold. I've got 2 layers of carbon and 2 layers of fiberglass matting for the middle. The fiberglass will add stiffness since it is not a directional weave.
I worked up some resin and got it all laid out and clamped the mold halves together.
About 2 hours later I popped the mold halves off the part. Thanks to the wax and PVA, it came off effortlessly.
The PVA is still on the part in the following few pics, which is why the finish is a little dull.
Uh oh! I must not have clamped the parts together good enough, and ended up with a big air bubble! :facepalm: The purple over the bubble is the PVA film.
There was also an excess of resin at the corner, but that can always be sanded down.
An air bubble on the inside, which isn't as big of a deal because it won't be noticeable.
A shot of the air bubble with the PVA film removed
And a few shots of the part with all the PVA removed. The finish is a lot nicer, and once I wet sand, clear and buff it'll be nice.
I'm going to try to mix up a little resin and fill in the hole, then sand it down and see how it comes out. If it doesn't come out nice, I've already been brainstorming a few ideas to keep the halves stiff and supported, and to be able to clamp them more evenly.