Here is a goal: To make a framed chalkboard, what should I do with the plywood after I've cut it to fit in the frame?

Which way makes more sense to accomplish this goal?

OPTIONS:
- Paint it with chalkboard spray paint before attaching it to the frame.
- Paint it with glossy black spray paint before attaching it to the frame.
Paint it with chalkboard spray paint before attaching it to the frame.