Over time your car is guaranteed to get some scratches here or there.  In addition, as the car ages the paint will begin to oxidize, turning white and flaking off.  Finding paint that matches the car paint can be difficult.  However, from Amazon you can order touch up paint that will exactly match that of your car.

Simply do a search in Amazon for your car make (Honda, etc.) and the color and you can get an exact match.  I have a royal blue Honda Civic with fading paint.  I did a search on Amazon for the touch up paint and came up with the following.

The paint is around $16 and can be found here on Amazon:

Dupli-Color AHA1003 Royal Blue Pearl Honda Exact-Match Scratch Fix All-in-1 Touch-Up Paint – 0.5 oz.

The paint comes in a tube and is very easy to use. It has a pen like applicator and also a brush applicator.

Note that while the paint is the exact same type as what was used in the car, it might not exactly match due to the sun wearing down the color of the paint on the actual car over time. These car paint touch up tubes are a great thing to have! The following video provides some details: