Have used the blue Venetian plaster in the past with better results. When burnishing the blue made a nice darker blue. However, burnishing Portabella color in Venetian Plaster produces dark gray streaks like pencil marks. The only help is to sand and sand and sand. Then a small amount of venetian plaster over the area as smooth as possible. Upon researching this product I found that most people do not burnish it due to this. So the finished product does NOT have the marble/ shiny product like you think it will. Because I was using this over old wallpaper (as opposed to re papering) it was ok without burnishing. It still looks upscale, just not what I expected as a finish. I tried wax on it as advised on some other sites, but it darkened and changed the color/ made it ugly. At the end I applied a semi gloss Polycrylic over the entire thing. It was like cheating to get some shine.