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I have a mesh that I tried auto painting the weights on. It didn't turn out as expected see this screen shot:
I'd like to set the weight on all vertices for that bone to 0
Delete the vertex group, select the bone again, and Paint.
Blender will create a new Empty vertex group for you.
Vertex group Bone.001 is on the right side of image. It is deleted on the left side.
By continuing to paint Blender created a new vertex group.
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