GRIT PROGRESSION |  What are...  |  Project sanding guide  |  Wood sanding guide |  Floorbelts & sizes |  Grit range scale |  Glossary |  To determine the appropriate grit range for floor sanding paper, start with the finest grit which will achieve the desired finish and work backwards to the coarsest grit. It is recommended that you do not skip more than one grit in your grit sequence. The following illustrations show exploded views of wood pieces representative of finishes with proper and improper grit sequences.  The following illustration shows the effect of proper grit progression on a wood floor. 1.  Start with a coarse grade, generally 36-40 grit. 2.  Follow with a medium grade, generally 50-60 grit. 3.  Finish with a fine grade, generally 80-100 grit. With a proper grit progression, each pass takes away the points left from the previous pass. The final pass leaves a smoothly sanded floor ready for stain or finish.  A quality job!  The next illustration shows the effect of improper grit progression on a wood floor. 1.  Start with a coarse grade, for example 36 grit. 2.  Follow with a fine grade, for example 100 grit. By skipping several grits, the final pass takes away only the tops of the points left from the initial pass. This leaves an uneven floor which will not take the stain or finish consistently.  If you need additional assistance, please send us an email or consult your local Johnson Abrasives authorized supplier.