you must use glue, not caulk or sealer. It is called GE Silicone II clear premium Glue. upc #0-77027-00280-5. I got it at True Value Hardware $5.99 for 2.8 fl oz. (true value order # 510-404) If you look it up on ge's website it is item # 280
good luck if you decide to go this way. I have a lot of nay-sayers to disprove - I suppose that this winter will be the true test.
Feel free to ask me any questions