Found my first scratch today in a rather odd place - about a 1/8" nick on my blacked out roof rails. Not sure how it got there (maybe a tree branch?) but I would like to fix it as it is right over the driver door so I see it every time I get in. My question is what color do I use to repair it? My Cayenne is JBM but I am wondering whether the rails are just straight black, anyone know?