There are a few different options that can be used for block sanding. One option is to use sandpaper that is attached to a block of wood. Another option is to use an electric sander. Either way, the goal is to create a smooth surface.
When using sandpaper, it is important to start with a coarse grit and then move to a finer grit. This will help to remove any imperfections in the surface. If using an electric sander, it is important to go slowly and move in different directions to avoid creating any scratches.
Once the surface is smooth, it is important to vacuum up any sanding debris. This will help to ensure that the surface is ready for painting or staining.