How bad of cracks are you talking about?
When I moved down South my horse could no longer go barefoot, he needed shoes due to the sand and harder ground down here cracking his feet and wearing them away quickly. My horse gets his feet done every 5 weeks because his hoof supplement makes the hooves really grow quickly.
I recommend Keratex Hoof Hardener for every other day application on the hoof and speaking with your farrier or getting a farrier to help you with this issue. It’s expensive and worth it.
I keep Whtie Lightning, Thrush Buster, and Keratex Hoof Hardener in my trunk always just in case.