nearly all manufactures paint has gone downhill, thank gov regulations for that.
anywho, to touch up, easy steps for me.
Buy the factory bottle.
Clean the chip: steel wire or soething else to scrape away the rust and paint remnants in the chip. You want clean bare metal in the chip.
Clean chip with alch.
Shake touchup paint well.
Take a piece of alum foil and dab the touch up paint brush on there so you have a small blob to work with.
Take toothpick, and use this as your "brush"
Work small, and slow. Build layers.
You need just a tiny dab on the toothpick tip.
key is to not have to swirl the toothpick in the chip hole once you lay the paint down. More movement will only make the touchup paint look worse. You want one smooth spplication.
Let dry 15 min. keep layering until the hole is filled well. Itll take at least 3-4 layers for a good job.
It wont be perfect, but touchup paint never is. This will be better than trying to use that brush.
Dont wax that area for a month or so.