I have had years of great results from Dr. ColorChip...It comes with the factory paint and another bottle of lacquer thinner that is used after, to get everything smoothed out and flat...
The most important thing that you need to do is to absolutely make sure
All the area where the chips are is Clean... Use something like Isopropyl alcohol, on a Q-tip, etc., get all the areas where the paint is going to go really clean, so it will help it adhere to that surface better...
I use an Auto Painter
Sword Brush to apply the products, and it is also the best brush for doing anything like this..
When you wet it in the paint, thinner, etc., it makes a perfect sword Point on the end, so it`s much easier to apply the product perfectly into the areas..
Go to an auto paint store and ask for a Sword Brush. It`s really small, on a wooden handle. This is what real Painters use for decades to touch up paint chips, and well, along with lots of years experience...
When done with the Sword Brush, rinse it clean in some thinner, let it dry and it will be ready to go next time you need it.. I have had this same sword brush for decades, and it`s still perfect..
Here a link to what a Sword Brush looks like --
Squirrel Hair Sword Stripers (20) This brush and others are sold all over, even Amazon carries them...
I have never had to go back, sand anything, buff anything, to make it look flat...
Yes, the color may Never be perfectly matched, as the existing paint may have faded a bit, depending on the color, etc., but the chips will all be covered with the factory paint, so they will be way less noticeable...
Good luck with this !
Dan F