Anyone know where I can find a spray chalk in a can in Des Moines? I want to spray it over a stencil on the sidewalk and it must be able to wash off with water.

I found a method to make a liquid version of chalk that involves corn starch, water and food coloring. The liquid chalk works great, but I have been unable to find a sprayer that will allow me to finely mist it over the stencil to create crisp lines.

Any help is greatly appreciated!