The brushes softened and took on the shape and direction of the surface, no longer working for my purposes. While this is intended for metal and the like, the Q&A suggested this would work for rock with debris from pool water. I removed a little but no more than 50%. I put it on a 4" hand sander. It looks great and none of the brushes have come loose. I would give 2 stars for my results in the application but 3 I think is fairer.
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