Now Take a pencil and scribble all over the area of the contour…. The lead will indicate any low areas that haven been sanded yet…
Now, continue sanding.. watching the darkened areas as they disappear..
As I get close, I’ll change to a finer grade paper, about 80 grit…. And continue until the darkened areas are removed, and the complete area appears evenly sanded..
Now… I use a tool I store 93 million miles away…. It’s the best indicator you can find…. The shadows will show any areas that aren’t evenly sanded and will reveal any lumps in the continuous roll of the contour…
moving right along…
Ron Kirn