Things to note when choosing the number of sandpaper sheets
Jul 17,2026
Sanding must gradually transition from coarse grit to fine grit, and it is strictly prohibited to sand directly across the grit, otherwise the deep scratches left by the previous coarse sandpaper cannot be completely eliminated;
Match the mesh number according to the processing requirements. For removing rust, welding slag, and thick coatings, 40-80 mesh is preferred. For spray painting, 240-320 mesh is used. For mirror polishing, fine sandpaper of 800 mesh or above is used. Do not use fine sandpaper to deal with large-area defects, as the efficiency is extremely low;
Avoid using coarse sandpaper below 120 mesh for soft wood, plastic, and paint surfaces, as it can easily leave irreversible deep scratches; for hard steel and castings, low-grit sandpaper can be used for quick removal;
Distinguish between suitable mesh sizes for dry and wet grinding. Below 800 mesh is suitable for dry grinding and rough processing, while fine sandpaper above 800 mesh is more suitable for water grinding and polishing, which can reduce sand clogging and improve smoothness;
Replace the sandpaper in time when there are flakes of sandpaper or a large amount of sand particles falling off. Do not use it reluctantly, otherwise it will cause irregular scratches on the surface of the workpiece;
Do not mix coarse and fine grit sandpaper in the same process to avoid confusing sanding textures and affecting subsequent painting and polishing effects.
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