SafePaint is a newly formulated milk paint designed for use on walls. Our original formula was created for porous surfaces like wood and masonry. SafePaint was formulated for use on non-porous surfaces such as previously painted walls and new sheetrock. It will also adhere to other surfaces such as metal, or prior finished wood, cabinetry, furniture, etc. And you can certainly use it on porous surfaces like bare wood as well. It is easily mixed, especially at higher speeds with a drill paint paddle or a portable kitchen beater. You just add water and mix.