That is a cool idea using kosher salt.
I think the main reason I stopped brushing potatoes, aside from there is never any dirt on the ones I buy, is that it takes the skin off if I brush at my "regular" brushing pressure. Especially if I wet them first. I always buy those large "restaurant style" baking potatos and the skin doesn't seem as thick as the smaller russets that are always on sale.
Give us this day our daily bacon.