Not according to the experts I've been watching on YouTube. These are tiny stone chips and they all advise to prime if it's gotten down to bare metal (after cleaning out the rust of course). They actually are quite adamant about not touching up over bare metal as it won't bond and/or will rust. Unfortunately none them get into exactly what type of primer they use. Thus, the question.
HAHAHHHAHA!!! Experts on youtube......SERIOUSLY?????
Im sure you'll find an expert brain surgeon on you tube as well. Would you still go and try the surgery yourself??? What 1 surgeon does is not necessarily the same or right thing to do compared to someone else.
Let me put you at ease......I work in the field. Have been getting paid to repair peoples cars for over 22 years. Im licensed. Im what someone might consider an "EXPERT". YOU DO NOT NEED PRIMER!!!
But, if you want to listen to a redneck backyard EXPERT, by all means......
PS. If you want to go above and beyond to repair a few knicks of paint, YOU DONT GO TO PARTS SOURCE!!!
You need to go to a body supply shop and get the primer and sandpaper. While you're there, you get them to pull the paint code off your car and mix the paint for you as well. They might even pull out a paint shade card to match it up exactly to your faded paint.
Did your youtube EXPERTS mention that?