>>9320755Clear gesso primer/base coat to give a rough durable surface to "draw" on. Then just clear coat it with whatever. UV protective acrylic would probably do the job if you wanna go full artist conservation.
I actually did the testing and setup in plans to paint and color pencil teh Edelweiss, but the kit is pretty bad and I never got around to finishing it. Have plans to mess with colored pencil on some other stuff though