I got rear ended at very low speed within less than 48hrs of taking delivery of my brand new car. This resulted in some paint being completely removed from a crease on the lower part of the bumper. For various reasons I have decided not to respray the bumper. Bought some touch up paint in a jar and need advice on how to apply it. The affected area is about 3inches across and under 1/4 of an inch high....it's basically a thin line across the bumper, on a crease. I will be cleaning the area with white spirit before doing anything. Do I need to apply a primer? Should I apply the primer/paint/clear coat with a fine brush or a cotton bud? Should I use cutting polish at any stage?