Hmmm, should have been okay at that. Ideally though the clear application tape wants to come off straight away, the longer it remains, the more it breaks down and can be trickier to remove. For whatever reason it tends to be harder getting a good adhesion on glass than paintwork, so just needs a little extra delicacy taken when applying. It's easier to break the seal between the vinyl and application tape if you fold the application tape back onto itself and slowly ease it off, in a small way that stretches the application tape and helps it come away