A little background... I acquired a 2001 Black Onyx ES300 three months ago, and the car already came with several paint chips on the front hood, including 2 fairly big scrape-like ones you'll see in one of the pictures below. Like many others here, I tried touching up one of the smaller paint chips with Lexus/Toyota touch-up paint (color code 202), and the built-in brush just doesn't work to my satisfaction on that one chip. I knew right then that I needed something more precise and with better control than the brush method, or even a toothpick. That's when I discovered, and eventually researched on, the Auto Sharp Pen, produced by Autovisuals.com.

Basically, this pen provides the much needed control to fill in paint onto the metal surface of the chip area, starting with the center, and working slowly outwards. The paint slowly soaks and rolls down the felt tip nib, which is actually very helpful for the patient person. All in all, from today's firsthand experience, I filled in close to 20 chips in about 2 hours, with no mess. I prepare each chip with a good polish, and dabbed with isopropyl alcohol to remove any wax so that the paint can stick. After the paint is cured, I use rubbing compound to make the painted area shinier, and put in another coating of paint or so until the surface is close to the same level. As you can see in the pictures below, the new paint doesn't truly blend with the rest of the body paint (fine-grit sanding or Langka is probably necessary here), but the pen is a cleaner and easier solution than the dealership's touch-up paint. You'll only see the visual difference inches from the hood, but from far away the paint looks solid. This paint pen product is definitely worth the purchase

Here's a pic of the 2 largest chips on my front hood.

 

After pic of the large chips.

 

Before pic of another chipped area (on the hood).

 

After pic of same area, different angle. Not an eyesore anymore...

 

Not bad at all. I've been thinking about getting one for my Black Onyx '96 (similar to your old car, but mine isn't a true Coach Edition (I've dropped in the seats, that's about it), to fix some rock chips similar to the ones on your new ES.
Is the paint pen as easy to work with as advertised? I'm guessing it's similar to the Testors brand paint pens I used to use on model trains. These things had a decent sized felt tip that was spring loaded, you'd push down on the tip to release extra paint. If you pressed too hard, excess paint would come out, so it took a fine touch. Finally, did you use any sort of thinner, e.g. Langka? . I remember reading in a previous thread that despite the AutoSharp paint being thinner than the "nail polish" you get at the dealer, it was still a bit thick.

 

Now that you have it touched-up take a black crayon and color in all chips and the rub excess off with a towel and it will looks even better ......use the crayon after every time you wax to remove the wax left behind, this works even on scratches .

 

Without a doubt, the paint pen is very easy to work with; you have much better control with this than with the brush method. The way it works is exactly as you described it. The pen product comes with a set of instructions when you order it. You can order extra felt tip nibs too, I went ahead and got myself one more
No Langka here, I used rubbing compound to make the painted areas shinier. It's like very fine liquid sandpaper, so for small touch-up jobs like this, that's fine and good enough with me.

Autovisuals (the company that produces these great paint pens) also supplies pens for cladding/bumper colors of our ES. You can call up their toll-free number and ask for the color code of your bumper. I'm thinking of getting another pen for mine, the rear bumper could use a decent touch-up job