Originally Posted by mr4speed
On the rounded areas that a block won't work try the small 3M sqeegee they work great for those tight curved spots, there just flexible enough yet stay flat to the surface your sanding, I use them all the time in those complex curves. If you are using guide coat after the 220 grit the powdered version works much better for showing ANY imperfections or sand scratches.
won't that powdered stuff wash right off when it gets wet? I've always just used a cheap can of black spray paint, or better yet, aerosol primer since it sands a little better.