Your molding is different than most I have seen, generally speaking if the molding will not stay in place then it is common to just replace it as often it shrinks and will not stay in place when the rubber ages and becomes less pliable. However, if I was to glue it and as it appears may be the case on yours, I would use a thin layer of back silicone along the edges of the metal channel and I would do this on a warm day vs a cold day or at least use a hair dryer to attempt to warm up the rubber molding while reattaching it. ~CA