What is a good general rule when wet sanding?

Using clean water to flush the area constantly while wet sanding is essential for several reasons. It helps to keep the sandpaper and the surface being sanded cool, which reduces the risk of damaging the paint or the substrate. Continuous water flow also washes away debris and paint particles that can clog the sandpaper, ensuring a smoother finish and preventing scratch marks from being created. Additionally, it helps to improve visibility of the surface being worked on, making it easier to see where further sanding is required and ensuring an even sanding process. Wet sanding with proper water management ultimately yields a finer and more polished finish than dry sanding would.