Lin (and who ever else works CF) I can emphasize enough, so I will repeat myself- Be sure and wear not only your standard protective gear (mask/glasses etc.), but also wear a long sleeve shirt, hat, and tape up your sleeve ends/neck area.
This CF dust seems to have a way of finding open areas in your clothing, and it will itch for a few days.
Also, ive since learned a trick to keep a spray bottle with water nearby when grinding, to keep the handle "wet", aids in keeping the dust down a bit.
I think im going to get me a couple of those "painters" suits and wear one next time I work it.