I ordered another paint pen. This time I got one that had the reservoir attached to the pen. The last one kept falling off causing a mess.

The tiny chips need to be wet sanded to remove the ridges and then a fine artist brush to fill the chip. Multiple thin coats with adequate drying time between coats is necessary so that the paint won't lift. Metallic paint, which I have will never be perfect. So don't beat yourself up if you can still see the repaired rock chip. Remember only you can see it. LOL