I have used them to finish furniture I am working on. After the 2nd piece of wood, I noticed that I was no longer getting good sand. I checked the paper, there were no visible signs of wear. but when I felt it, the paper was smooth. The grain on this paper wears out, you don't see it going through the paper, it just smoothes out and loses its graininess. very fast. I went through about 5 of each grit just to sand a small 4 foot long pad.
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