Okay all you paint masters out there -

I have scoured these forums for information on stripping and repainting bikes and see a lot about aircraft remover for stripping. Is there some prep work that needs to be done first? I am trying to strip a set of handlebars and the aircraft remover has done nothing. I have used the same can on a vent cover and the paint bubbled right up for easy stripping. Is there a difference between the paints used on these two things? What am I missing?

Oh, and yes, I am aware that you only spray in one direction. I have been doing that. Still no results.