I usually use steel wool 0000 for deburring woodwork after applying polyurethane. Synthetic 0000 isn't good for this - I had to apply a lot of pressure, and even after much longer rubbing than real steel wool, the board still had a rough surface that didn't remove brush marks and dust particles. I came back to present for a few seconds and now the board is as smooth as glass. There are probably some applications where this plastic could be useful, but deburring polypropylene is not one of them.
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