What is a consequence of skipping several grades of sandpaper grit?

Skipping several grades of sandpaper grit can lead to the next grade being less effective because each grit level is designed to gradually refine the surface during the sanding process. When you skip grit levels, the difference between the last grit used and the next one increases. This can create a situation where deeper scratches from the coarser sandpaper aren't adequately removed, making it more difficult for the finer grit to produce a smooth finish.

For example, if you move directly from a coarse grit to one that is too fine, the fine grit may not be able to remove the larger scratches left behind by the coarse grit. This could result in a surface that is not as smooth as intended, and additional time and effort may be needed to rectify the issue. Proper sanding progression is essential for achieving a high-quality finish, which highlights the importance of not skipping grades.