i used 1500 wet and dry to flat out the scratch then i used some 3000 trizact to reome the marks from the 1500 then g3`ed it and wax polish,
you do have to be carefull when doing this and as rich said make sure it is nice and wet, when flatting mine it was wetter than it looked in the pics.
as for the guide , im just waiting for it to apear in the guides section