Castaloy is a cast iron repair rod that is used to fix items such as engine blocks, pots, pans and fences without the need for welding. One can repair different items with castaloy are antiques and figurines, Wrought Iron Fencing, Engine Blocks, Cast Iron Cookware, Pans, skillets and griddles, Stoves, Radiators and Fireplaces. Castaloy, Decatur, USA.