How to bind rebar with zero weights?

Question

Animation

I have a complex mesh. When I bind an armature to an object with automatic weights, the weights are distributed in a way that I don't want. I need to attach an armature to an object so that initially each bone has all the weights on the mesh equal to zero. (all blue). And then I will manually paint the right places. It's just that when I try to make all the weights set to 0 with a brush, there are places with non-zero weights, since the mesh is complex and hard to find.