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Medium scratches: These pass through the varnish and reach the colored layer. They require more work, although their appearance may sometimes be reduced.
Deep scratches: These reach the primer or even the metal. In these cases, professional repair is generally advisable.
To get a basic indication of whether a scratch is superficial, gently run your fingernail over it. If your nail does not catch on the mark, it may be a shallow scratch that could potentially be improved using
