Sanding irregular and uneven surfaces can sometimes be a problem. Corners and grooves can be extremely difficult to reach with a flat piece of sandpaper. For sanding irregular edges of table tops, chair legs, etc., use a deck of cards as the sanding block. The cards and sandpaper will adjust to the contour of the surface you are sanding. This makes a sanding block that is quite flexible, yet provides a firm base for holding the sandpaper against a curved surface.