chalkboard paint

i picked up a martha stewart magazine at the library (jan 2oo7) and discovered a chalkboard paint recipe to make any wall paint color into chalkboard paint. i am thinking about using it on a wall above a table i am putting in the kitchen when i redo it. the recipe is very simple:

1 c. flat paint, color of your choice
2 T. powdered tile grout

mix and apply several coats on wall to evenly cover. sand with 150 grit sandpaper until smooth. condition by rubbing side of chalk over surface and then wiping off with a lightly damp sponge.

i'm not sure greg will be crazy about this though. we'll see. also, i just sent him to the store with the paint chip selection for the kitchen and i'm sure he'll purchase semi-gloss instead of flat. personally, i prefer flat but he likes the semi-gloss. i just don't care for shiny walls but i guess in the kitchen, it's more scrubbable that way.