Once the light grey was dry, which didn’t take long, I sanded the edges with 80 grit sand paper. I like a really rough sand paper for this step, because it leaves great scratches in the paint. I also like to do this step by hand. It’s harder on the biceps, but I have more control and it looks more natural than an electric palm sander. Instead of rubbing the sand paper back and forth, rub it across the surface in one long stroke, while applying hard pressure to the sandpaper.