American Sanders OBS 18DC Orbital Sander - Manual (Page 9)

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Clarke ® American Sanders Operator's Manual (EN) - OBS-18/18DC HDTR - 9 -
Sanding Cuts and Sandpaper
Initial Cut
The purpose of the initial cut is to remove old finish and gross imperfections on the floor surface. Use a course (20-36 grit) grain
abrasive.
Final Cuts
The purpose of a finishing cut is to remove the scratches produced during the initial cut. Use a fine (60-80 grit) grain abrasive.
If the surface remains rough after a finishing cut, it may be necessary to use an even finer grain of abrasive (80-100grit). Care should
be taken in selecting the grit size of the abrasive. A very fine grain will close the pores on a wood floor making admission of a stain
difficult.
If glazing or burning should occur the abrasive has dulled and must be replaced.