Hi @dough__run ,
as far as I understand it, Normalizing Weights means that all Vertices that are assigned to deforming Bones, have a total Weight of 1.
If a Vertex belongs to only 1 deforming Bone, then it gets a weight of 1, when Normalized.
So it’s not so much, that each Brush is working as the Add Brush, but each Vertex is set to 1, in the Example with Suzanne.
If a Vertex belongs to 2 deforming Bones and both have a Weight of 0.5, than you can add or subtract something from either, subtracting 0.3 from one, will add 0.3 to the other.
