What are the reasons that wet sanding is superior to dry? Less clogging of the paper?
The short answer is yes but it's more than that. Since the water keeps the sandpaper cleaner, sanding is much faster. Also, as the dry paper loads up it has a tendency to trap pieces of the abrasive which leads to scratches in the sanded surface. Usually not apparent until you put the topcoat on. By then it's too late and a wet sand/recoat is necessary. Finally unless it's going to be a garage queen it'll be getting wet anyway when washed and rained on.
