Just hand sanded 300 tongue and groove boards to prepare for painting. The first 50 used a 3M Sandblaster 150 sandblaster, the next 250 used Norton. Norton seemed to last a little longer on average. By tearing at 1/4 sheet I was able to sand about 3-4 parts with Norton versus about 3 for 3M. Either way, it's good sandpaper. Paper never tears. I only wish they had lasted longer to avoid having to keep changing sanding blocks.
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