At this stage of sanding, remove the sawdust to avoid subtle pitfalls. Using compressed air, or vacuum, or a brush will do the trick here. To make the surface more appealing, be sure to remove dust using a tack cloth. Now, you can advance through various grits of sandpaper until you get the desired finish. Depending on the application, some will end at 120 and some at 220-grit sandpaper. The process will not take long as before when you went through different grits. That's because you have already flattened the surface using an 80-grit and even smoothen it using the pencil method. You can use the pencil method for each grit sandpaper to get a more delicate finish. The pencil marks will get lighter as you proceed to the higher grits.