The room had previously been an "art" room and had spray paint graffiti, paint splotches and various other stuff on the wall to be painted over - milk paint will go over it, but it doesn't cover it up like the toxic acrylic paint does. It also may cause the paint to run some in those areas- adding various textures to the wall. Personally I love the character it gives, being I am from a generation & culture full of graffiti art. This last pic is a close up of the textures it gives. I want to note that the most brilliant feature of this paint is that it is totally non toxic, it has no VOC's, I came into this room the very next day and had no reaction (which is a miracle), the smell of it was a weird earthy smell (my friend called it a "circus tent" smell) which dissipated within a few days. The paint itself is only three organic ingredients: powdered milk protein, lime and earth pigment! I am going to say the best way to learn about this paint is to go read the testimonials on the website because people give great advice on how to achieve certain finishes and textures and tips on mixing - plus one guy told a crazy story about how his blue milk paint fell into his fish tank and he didn't even clean it up, but not one fish died and the water cleared itself up! I mean, the real question is... Is it all worth the effort to mix and play? YES! Totally. I give 5 stars, two thumbs up and highly recommend it to the chemically sensitive and the artistically inclined.