Some may not agree with me but I love Corona...not corona hoof treatment, the plain straight tube. In winter I warm it up until it's soft and easy to work with like a lotion, put on some rubber gloves and then smear it all over the hooves including the underside and wedging a gooey sloppy amount into the frog and crevices. That stuff is waterproof as heck, resists bacteria and seems to lock out moisture for a long time. When it gets cold it hardens a little too. The only drawback is it can be messy and your bedding might stick to the outside of your horses hooves.