EMERY PAPER & EMERY BUFFSTICKS
Emery paper and emery paper wrapped and glued around wooden sticks to form buff sticks are mainly used to sand the surface of a item to eliminate the marks caused by filing after forming a piece and really bridge the gap between using a file and polishing. However emery paper and its equivalents comes in a range of different grades and can range from a coarse as a file to as fine polishing abrasives so are very versatile.
In theory you use a range of grades, starting with a coarse grade which is less coarse than the last file you used, or if going straight from forming coarse enough to remove surface marks caused during forming the piece and the use progressively finer grades. Progressing when all the marks from the previous grade are eliminated from one grade to a finer grade should ultimately leave the surface free of marks or directional graining ready for a final mirror polish.
When using emery paper or buff sticks it is best to change the direction of sanding, as sanding in the same direction can intensify marks not remove them. Constantly changing direction will help remove marks but maintaining a certain direction shortly before progressing to a fine grade and then switching direction with the subsequent grade will help you visually see your progress of removing the abrasions left by the previous grade.