I'm extremely conflicted about trying a recipe for dulce de leche. I've read so many times that boiling a can of sweetened condensed milk for dulce de leche is perfectly safe, just as long as the can stays covered by the boiling water. I saw another recipe that recommended using a slow cooker for this.
I thought the can would explode if you do this. Would it work if I punctured vents into the top of the can and pour water till it reached the 3/4 way up the can and simmer it for the required 2 to 4 hours to reach the proper consistency.