How to choose the right grit size for sandpaper?

When choosing the right grit size for sandpaper, it's important to consider the material you're sanding and the desired finish. Coarse sandpaper (grit 40-80) is ideal for removing large imperfections or old paint. For a smoother finish, use medium grit (grit 120-220), which is perfect for between layers or smoothing surfaces. For a super-smooth finish, such as when working with paint, choose fine sandpaper (grit 400-600). Remember, it's always good to start with a coarser grit and gradually move to finer grits for the best results.