I use Epoxy Parfilm. It's in a spray can and is a wax release. Just google it and you'll find a distributor. It also works great as a release for urethane/resin castings too.
I've used enamel and lacquer spray or brush paints and acrylic paint brushed on. All work just fine as a barrier coat and the first test casting from the mold will take the paint with it. FWIW.