The actual trouble with touch up paint is, very few people know how to do it properly.
I was a automotive painter for 25 years, and got really good at brush touch up. It take patience and a steady hand.
A quick run down on how to do it.
Buy a set of camel hair brushes..... don't use the built in touch up brush.
De-wax the chip. Prepsol works well. You could probably talk your local body shop out of a baby food jar full. Or use denatured alcohol if you can't get anything else.
Use just enough of the color coat to "color" the chip. Do not try to build the paint up. When the color coat is covered, and the metallic or pearl is even looking....STOP. You will use the clear to build up the surface.
the chip.... don't color outside of the chip. Use both hands..... steady your brush hand with your free hand. Have lots of light available. And buy a pair of magnifying glasses. Even if your eyes are good, the magnification is helpful to stay inside the chip. If you do go outside the lines, carefully wipe the excess paint off immediately.
Use your clear to build up the paint until it is slightly higher than the stock paint. This will take applications over a period of many
days. You want the clear to dry before applying the next coat.
The next part is what scares some people.
Wet dry sand with a block to level out your clear to the same level as the OEM clear, using 800 grit then 2000 grit ultrafine wet&dry paper. Make sure you keep the sandpaper wet by dripping water with a sponge or rag. Try to only
sand the built up clear as much as possible. Try to not remove very much of the OEM clear. There's not much of it there.
Polish with medium compound, by hand, adding a little water to thin the compound as you go, then use swirl mark remover.
As I said, it takes patience. I fixed a chip on my left saddlebag lid this summer, and if you don't know where it is, you can't find it. I would take a macro close up picture of it.... but, it would just be a picture of Cool Blue Pearl paint
The tri-color paints are a bear to match with a brush. I did my wife's tank, and you can see the repair, because of the color difference..... but you have to look pretty hard.