I just did one application on the one I treated, but I caught mine very early. The cinnamon really seemed to dry things out (I sprinkled it on pretty thick in the crown and the leaf axils). If no one else chimes in, I'd say use your judgement about re-application.
The peroxide will damage living tissues. The hope is that it'll damage the fungus and/or bacteria infected tissues killing the fungi and bacteria. Then, the cinnamon will dry things out (it may have some anti-fungal properties too). Once things are dry, the environment will no longer be hospitable to the fungi and/or bacteria and the plant can recover.
I don't know how much protection the waxy cuticle on the leaves provides from the peroxide, but I'd be wary of over doing it.
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