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Much less grit loss than other belt types, and can be easily de-gummed by running a hardwood across the belt. Definitely worth the investment, these pay for themselves many times over. Best belts I've ever used. These things greatly outlast cheaper cloth belts, and it especially shows in a high-output environment.
These belts make sanding go a lot quicker and the results are excellant. They are very aggressive yet leave a very smooth, very consistent surface. These 3M belts may cost more, but you will save money in the long run because they last many times longer than a standard belt. I used to use the "bargain" belts, buy 12 get 12 free.
I love these belts. There aren't any course scratches caused by large grit particles like you get with cheaper belts. The best part is when the belt starts wearing out, with the butt splice all you do is turn it around and its almost like putting on a new belt. The first time I used one was the free one that came with my 4x24 Porter Cable belt sander.
Not any longer. Definitely worth extra money they cost, cheaper in the long run. I couldn't believe how long it lasted. The 100 grit is perfect for most general sanding tasks.
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