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Sandpaper:

Sandpaper's level of abrasiveness is expressed in the term GRIT. The higher the grit number the finer the finish. For example: 50 Grit paper would be very rough, used to grind a very rough surface. This paper will leave swirl marks in the surface. 100 grit would be used on a smoother surface. This paper will also leave swirl marks. 400 grit would be used on a very smooth surface. Usually to remove swirl marks left by rougher papers and finish edges of bodywork. 600 grit is used to remove any imperfections left by the 400 grit.