You would get better results feeding soybean meal. Hooves are made of keritan, which is protein based. Soybean meal is a protein food. You don’t need to add a great deal to the food, but it really does help build better hooves, shiny hair. It is fairly inexpensive as a feed additive. We have the Elevator folks add it to our grain mix.
Raw soybeans are poison for horses. I never had any horse want to eat whole, cooked soybeans, just did not appeal to them when offered a handful. The soybean meal is cooked, ground fairly fine, blends in with grain. Horses seem to consume it readily.
Some horses are sensitive to soybeans, do not tolerate it, according to COTH posters. Luckily I have not had any such sensitive horses.
A protein additive is your best way to improve hoof quality. Remember, ANY hoof change will take a LONG TIME to show. Six months is about as soon as you will see real results on the hoof. Nine months or more, for a whole new hoof capsule to grow down. Exercise helps growth. So you will need to be persistent in feeding the chosen product and patient in waiting for the results to appear! Good hooves come from the inside nutrition! Paint-on products may help the walls you look at, add some moisture, seal the walls, but will not really make them BETTER walls.