Preparation Is Everything When Casting A Foot Stephensville, Texas, equine veterinarian John Janicek told attendees of the American Association of Equine Professionals (AAEP) annual convention that it is imperative to have all your materials organized and ready when casting a foot or limb. Be aware of water temperature that you will soak the casting material in, as the warmer the water, the quicker the material will set. He’ll typically soak the casting material for about 10 seconds prior to application.