The brush usually holds too much paint. When it's applied, it forms a sort of "bubble" of paint, which will be too high compared with the surrounding paint.

The end of a match without the goop, that is, the torn end of a paper match... Holds just enough paint to dab in there.

The trick is to build up the paint, rather than have one big gloop of it. This way, later on you can just wax over the whole ordeal and it'll mostly disappear. Whereas if there's too much paint, you'd have to wet sand it down. The match also offers more control.

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2001 Solar Yellow SE 4x4 V6 5spd