Does anybody know how to texture paint scratches?

Does anybody know how to texture paint scratches like this guy in the video does?

Trying to paint some scratches onto this, I’ve already painted onto my UVs, hopefully I can just paint over the white without it affecting the black maybe.

In the video you can see how,the metal material is showing,after he has painted the strokes.That means he uses the painted texture as mask,to blend between the white material and the metallic material with a mix shader.The painted mask is used as factor into the mixed shader.

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Would you happen to know any tutorials that can help with what you said?

Dont knowing a special one,here you can go trough

https://www.youtube.com/results?search_query=blender+texture+paint+mask

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