I use a lot of sandpaper when cleaning up parts, and I am always cutting strips off of the bigger sheets. I cannot easily tell the difference between 220 and 320 grades or 320 and 400, but I always have a Sharpie at my workbench. Every time I cut a new strip, I write the grade on the back so I’ll know what it is later on.
Tip submitted by:
Wayne CassellLittleton, Colorado