Iodine and horse hoof?

Iodine/formaldehyde mix is fantastic for hardening the sole. You can get the proper mix from a vet. Paint on the sole NOT the frog, but in the crevice along the frog. Do not let it get on the hair. Use it no more than 2 times a week, if the soles are kinda soft, until hard, and 2-3 times a month for preventative. ( like you are ). This mix works great if you have any sort of founder / laminitis problems. Also, if you have sandcracks, you can paint the cracks and it will prevent infection from gravel, etc.