Take a look at this instructional vidoe and learn how to use the paint bucket tool in Google SketchUp. Selecting the paint bucket tool will open the materials browser. The materials browser is different for windows and mac users. On windows, the browser has two main tabs to select and edit materials. On the mac, you have several tabs giving you different ways to paint colors into your model. To start using the paint bucket tool, simply pick a material and choose a surface to paint it into your scene. You can also pick multiple scenes to paint them all at once.