>>5999671Drybrushing is better for adding a bit of wear to metal parts like frame or for highlighting raised details.
For chips there are a couple methods, but the sponge technique and using a small brush to handpaint them in are two of the most common and yeild good results. Plenty of videos on youtube on how to do both.
Just remember that with chipping "less is more". It's easier to decide you didn't weather it enough and add a little more than it is to do too much then have to fix it.
And seriously, before starting google what chipped paint looks like as well as some pro built models to give you an idea. You only think you know what it should look like. Trust me, I'm not trying to be elitist, this is just how everyone is at the beginning with weathering.
And sorry about the watermark on the image, I can't find the version without it at the moment.
