[BR3W CITY]

wax paper can work, just make sure it doesn't crinkle or fold on any edges, since that will transfer to the shape of the fiberglass. Petroleum jelly rubbed on tinfoil works, as does true "release agent" spray.

Are you using the woven fiberglass sheets, or the chopped mat (looks like cat hair)?
You can do layers over each other while wet, but its recommended that you take a roller and go over the layers, pressing them into each other and removing some of the excess resin. While you need enough to soak the layers and harden, too much resin will take longer to dry, and can cause bubbling or seperation of the layers if they aren't bonded well. Sanding big resin chunks off of glasswork sucks.

You can do CF with similar techniques, although there is a bit more work to get the CF to turn out "Show quality"