I asked a lot engineers at work and also big auto fans.

本帖於 2012-07-19 20:43:13 時間, 由版主 單身老貓 編輯

This is not what they told me.  It depends on the scratch.  the one on his car only needs to be partially sandpapered and spot paints.  Those are only 2 cm long and 1/4 of a cm wide.

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