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I've wet sanded a lot of deep scratches mostly with success but basically your lowering the paint around the deep scratch. If it's as deep as described it's probably not coming out with compound that's why I suggested filling it with clear coat and then wet sanding the area smooth but level then compound then polish. Just depends if it got below the clear coat if so then let a professional try. My method costs $10 if it works and a body shop won't even look at it for $150.
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1995 325i, 1996 328ci, 1997 528i, 1997 Z3 2.8, 2000 528i, 2001 X5 3.0, 2001 330i Convertible, 2002 M3 Convertible, 2003 M3 Coupe, 2004 M3 Coupe, 2004 Z4 3.0, 2004 X3 3.0, 2007 X3 3.0, 2007 335i Convertible, 2013 X1 28 sdrive, 2014 M235 manual, 2020 X3 30i Xdrive
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