This incredibly unique paint can create all kinds of looks and finishes easily, and best of all it's all natural! As the name implies, milk is one of the ingredients of milk paint. When mixed with lime and some pigments a paint is produced that can be used on a variety of surfaces. The protein (casein) within the milk acts as a binder and the water portion of the milk becomes the thinner. Remember, it is the lime that plays a big role in the Milk Paint recipe. When lime dries it becomes very hard (as it converts back to limestone!) and the result is almost like having a thin layer of reconstituted stone on your project. Another additional benefit attributed to lime is that mould and mildew do not grow on this slightly alkaline material.