I have wanted a wall size chalkboard for ages. I want one in the kitchen to write grocery lists on and to allow kids to color on and I want on in our attic/future play room. I found a great recipe to make your own and I plan on trying it very soon. I'll post pictures of my results.
1. Pour 1 cup of acrylic latex paint, in the color of your choice, into a clean, 1-gallon bucket.
2. Add 2 tablespoons of dry, unsanded tile grout mix into the paint, and mix until the paint is smooth and clump-free. (Use plain grout mix without added pigments to prevent color shifts. We used a kitchen whisk to mix our paint.) Repeat the mixing process until you have enough paint to complete your entire project.
3. If necessary, prepare the wall with a light sanding or priming. Apply the chalkboard mixture to any paintable surface with a roller or brush. (We used two coats of our chalkboard paint to build up a thick surface.)
4. Allow the paint to completely dry, then sand the surface with fine sandpaper until you achieve a texture that accepts chalk. Next, "color the surface with the wide part of a piece of white chalk to get a chalkboard-like patina.
5. Wipe away excess chalk with a damp cloth.