How to sand with waterproof sandpaper?

To sand with waterproof sandpaper, start by moistening both the sandpaper and the surface you're working on. This ensures a smoother finish and prevents dirt from accumulating. Use light pressure and make long, even strokes, working in the direction of the wood grain or the surface. Rinse the sandpaper regularly to remove dirt and maintain its effectiveness. After sanding, clean the surface to remove any remaining debris, so you're ready for the next step in your project.