I've got an upopened can of sweetened condensed milk simmering on the stove right now (will be making dule de leche ice cream tomorrow). So far so good, no bulging or anything. Now, when I take it out of the pot, do I let it cool at room temp? Put it in the fridge since I won't be using it till tomorrow? I was so worried about the cooking process that I hadn't figured out what to do when it's done! Thanks!