There is about a zillion time difference between double boiler and presto. Once you go with a presto you will never go back. I usually pre heat my pour pot for transferring or as everyone says, there will be a significant drop in temp. Sometimes when I do this, it takes forever for the temp to drop enough for me to add my fo. Kind of a delicate balancing act. If your pour pot is just a little warm, you can pour your hot wax, add your color/fo and stir and stillhave time to check temp and stir some more, befor final pour.