M_Boats: Fairing the cb

After reading Jerry's page about fairing "Coyote"'s keel to make his M17 go faster I looked at the cb I had just dropped out of my own boat. It was a very rough casting made of cast iron. Now I know not to every use STEEL wool on my boat but that knowledge did not transfer to the pounds of cast iron grinding dust I took off my cb as I feathered down the trailing edge to Jerry's specs. So after washing down my sidewalk with Muriatic acid and my driveway and my wife's car (I told her it was tree drippings and I did NOT use muriatic acid on that) I have a great respect for containing cast iron powder. It even stains plant leaves. GADS!! Fortunately the wind did not carry it to my boat!!!! Word to the wise. Smarter (?) in Rockport, Tom B