Hi I've been sanding inside my boat, taking off a spray paint layer that a previous owner put on it, for about an hour now. This is my first time using a power sander and not sure if I'm even doing it right. Do I just do small circles or long strides back and forth or just hover over a spot? Also I'm not sure what wet sanding does but maybe I need to do that? My progress so far is maybe 1 square foot total area of corners that have been sanded because the paint was thin there. So my questions: -technique -wet sanding? -grit? I'm using 200.