Is it? I am talking about metal poisoning not the explosion risk, will the can leak dangerous metals into the dulce de leche product when boiled or is it safe to eat? (I am hoping it is because it is very convenient but if its not what to do safety first)
DO NOT COOK in containers made for packaging. They contain an epoxy coating that will leach BPA into your food when heated to cooking temperatures. This is especially true with the recent craze of cooking sweetened condensed milk in an Instapot (pressure cooker). Inside a pressure cooker water boils at 250 degrees. Everything is hotter than on top of the stove and, even more BPA will leach into your caramelized milk.