This is how I cut a tall hairspray can from Aveda. I love Aveda hairspray and I often collect the empty cans from @anthonyssalon513 (where my fabulous stylist Amy is helping me go gray, but that's another story).The can is punctured, cleaned, sanded and then I begin cutting.
The metal can easily be manipulated. Once it's all cut, I flatten the center with a ball peen hammer and drill a hole in it to make it easier to attach to the flower base.
I use the long strands from these kinds of cans to create some movement with my flower sculpture. I tuck them beneath the heavier solid pieces of metal.