Last weekend I took the old expired registration decals off my Zodiac dinghy. They were stuck real good, and I had to pick them off bit by bit. I then cleaned the area with alcohol and applied the new decals.... Yesterday I webt to the boat - found one decal had come off the dinghy completely (found it underneath), and the other was waving in the breeze and about to come off any minute. I don't understand why these should be so different from the previous ones in the way they stuck...Anyway, the task is to find a glue or other means of sticking these decals back on to the Zodiac's pvc hull. Any suggestions? Double sided tape? It's gotta last two years.Derek