I just had mine fixed by a guy at a carwash who glues back tons of these becasue when the cars go from hot sun, to cool washing, and back to hot sun, it makes them fall off sometimes.
he said don't use the kit
don't use gel super glue
use regular super glue - hold it in place for one min - then don't touch it for 24 hours
So you have to position it the enxt day
if you position it after 15 mins, it will fall off in a about a week.