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The backing of a metal worker's sheet is very porous and rough. Improper sanding can cause scratches in the gate sheet, and these scratches will be very noticeable during the final finishing process with synthetic enamel or automotive paint. 🔴 Incorrect sandpaper grits: 80 - 100 - 120 - 150 🟢 Correct sandpaper grits: 220 - 240 - 320 - 600 Avoid problems during finishing; follow this tip.