I used a paint pen on my old 325i (before the insurance adjuster took a look at it after the accident). After the paint dried, I gave the area's I touched up a coat of 3M wax. It did blend the new paint pen touchups a little bit with the surrounding areas.
1994 530i 5 speed - RIP due to a dipshit that can't do overshoulder checks and ran over the front end with his Jeep!
1989 325i - RIP due to a knucklehead that rammed the car in the butt doing 50 km/hr while I was stopped at a intersection!!
New ride: 1998 318i