i actually just used a 8" x 3" sanding block and made sure to just sand with the block touching 2 surfaces so it remained flat against the face of the sprocket. I found that sanding it by hand could potentially round the edges of the teeth. And as for the the race can I just used Dupli-Color High Heat ceramic paint. It works great I just sandblasted the can, cleaned it with alcohol, put 4 light coats of the paint, let it cure for about 30hrs then baked it in my BBQ for 2 hrs at 300F. Worked out real nice, I will post up pictures once its installed.
meetch