the grey sideskirt? no, it's a type of coating paint right over the metal body sideskirt. you can remove the grey, and get to the body color below. if there's a dent in that, then you'll have to fill it.
FOUNDER of the BMW-Forums Michigan Club
<span style='color:green'><a href='http://www.cardomain.com/memberpage/458339' target='_blank'> Car Domain UNFINISHED </a> </span>
<img src='http://www.bmw-forums.com/forum/uploads/post-4-1078289877.jpg' border='0' alt='user posted image' />