What grit sandpaper should not be used on aluminum areas?

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Multiple Choice

What grit sandpaper should not be used on aluminum areas?

Explanation:
Aluminum surfaces are relatively soft and scratch-prone, so using very coarse abrasive paper can gouge the metal and damage the protective oxide layer. A 36-grit sandpaper is rough enough to leave deep scratches and ridges, which can compromise corrosion resistance and make coating adhesion unreliable. For aluminum, you want to avoid such coarse grits and instead prepare the surface with finer grits, gradually smoothing it to a uniform finish before any coating. This is why a 36-grit paper should not be used on aluminum areas.

Aluminum surfaces are relatively soft and scratch-prone, so using very coarse abrasive paper can gouge the metal and damage the protective oxide layer. A 36-grit sandpaper is rough enough to leave deep scratches and ridges, which can compromise corrosion resistance and make coating adhesion unreliable. For aluminum, you want to avoid such coarse grits and instead prepare the surface with finer grits, gradually smoothing it to a uniform finish before any coating. This is why a 36-grit paper should not be used on aluminum areas.

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