I also love using egg tempera. I almost can't stop painting. I turned in at 4am last night. I love the control I have over the paint. Especially with small details. Egg tempera dried almost instantly.
This painting actually started this past summer when I had Windsor Plywood cut a few sheets of baltic birch into 8x10s. Then I spent a month sanding, sealing, gessoeing, and scraping. I just totally love those panels. Smooth as silk and sooo inviting. Really worth the effort.
I haven't sealed or varnished this work yet. I'm not sure if I will seal it with shellac and then varnish. Or if I'll do olifa....varnished with linseed oil medium. Or if I'll just burnish the surface to a slight sheen.