I bought chalk paint and the staff advised me on how to use it differently for different projects. This idea of thinning chalk paint is good when doing wall projects. The chalk paint will also go farther. It can be made thinner. The choice is up to you. Hope this idea helps you when considering working with chalk paint.
Tip: When applying chalk paint to furniture it is better using it undiluted unless it is new wood. It coats well on any furniture but has to be top coated after because it scratches easily.