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

来源: 于 2011-11-09 14:16:31 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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.