1FS HARD is an aggressive, high-abrasion polishing compound. It effectively removes flash rust, heavy oxidation, and deep scratches left by 600–800 grit sandpaper. Ideal for rough, heavily worn aluminum surfaces. This compound creates a base-level mirror effect with visible scratches, which should be refined in the next step using 1FS. Its greasy consistency helps cool the surface and allows for stronger polishing pressure.
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