Barracuda Grill Question

Somebody makes a "welding rod" that is made for repairing pot metal & can be used with a propane torch. I don't know where to buy it. I bought some about 15 years ago from a guy who was demonstrating it at a "Steam Engine & Tractor" show. He was even using it to fix holes in aluminum beer cans. It works pretty well if you can find it.