Have you tried the 3M adhesice tape that is meant to hold trim on? If that stuff won't do it, nothing will. You can buy it in auto parts stores in the same section as bondo and sandpaper. i think I bought my last pack at Wal-Mart.
Slonaker
EDIT: This stuff
http://multimedia.mmm.com/mws/mediaw...66SS1ec7rrrrQ-