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Deburring, in order to be able to polish the flat surface more smoothly and make the grinding easier to handle. You can use scrapers, sandpaper, and abrasive tape to sand.
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If it is very serious, use fine sandpaper (water sandpaper of 300 or more), and if it is not serious, use a scouring pad for washing dishes until the wood hair is removed.
Polishing is thankless, dirty and tired, and quality problems are all about grinding.
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First, the choice of sandpaper must start with a coarse sandpaper of a low specification (e.g. 80 or 120 shirt) and then use a high-gauge fine sandpaper (e.g. 240 or 320). The second is to pay attention to the curvature of the product, we must grind along the radian, and we can't rent silver to polish the radian, which is very technical content. You can also take a look at the post bar "Buy Furniture", which has a post about your question, which is detailed and professional, which should be helpful.
Because of the old saying, dogs can't change their!