Has anyone ever tried color matched polish?
Some douche keyed my sons new used car yesterday and gouged a nice line in the fender and door. Touch up never matches and makes it look worse. Of course, the car is red.
While far from perfect, the factory matching touch-up paint is going to be the best option for repairing the scratch so that it does not immediately draw the eye when glancing at the body panel.
It takes some practice, but with some work and usually several mulligans, you can actually get it to where no one will notice it unless you point it out them.
The color matching waxes/polishes will not help your son's situation, at best they will make the paint shinier and cause the scratch to stand out more.