Confused about using plywood, etc. for wax/oil pastel art
I've been experimenting with mixed media on plywood, birch, wood boards, etc. and really love the texture. Wasn't sure where to post this.
I'm using Caran D'ache Neocolor II, Posca paint pens, and Pitt brush pens. I don't always wet the Neocolors, so they are more like oil/wax pastel. I am also experimenting with Neopastels.
I'm confused about the longevity of using plywood (or birch) for my substrate. Here are my questions:
1. Can I use ungessoed birch plywood?
2. Do I have to sand plywood down?
3. If I buy cradled wood boards, can I use them without gesso?
4. What should I spray or fix the wood with if it will be hung unframed? The dry Neocolor and Neopastels are easily rubbed off. So I'm not sure what to do.
Thanks for your help!