It’s quite easy to forget that most of your woodworking tools, especially the chisels have two sides that require maintenance. The back should be dead flat and should enable you to cut straight. However, you’ll have a bevelled front side. Each one has to be sharp and there be various methods to do it. Yes, you can sharper you’re carving tools with sandpaper. For that, you should start by rolling the honing guide on the 80-grit sandpaper for sharpening the chisel.