Years ago I painted with iodine tincture. It did deliver iodine into the tissue; I could feel the effect. But it was very irritating to my skin, and there is simply no way to paint enough to correct the conditions that lead to breast cancer. Painting is, I believe, best used in conjunction with oral therapy.
Some people take breaks from iodine, especially in the beginning when detox symptoms become overwhelming. Later, people develop their own styles for using iodine permanently. I am one who takes it every day without fail.