do you have an air compressor?!?! if you do then you can drill a hole in the bottem center of that can and put a fittings and then you will never have to buy another can of aerosol.
WARNING!!!!! if you do try this obviously make sure the can is empty. when drilling into the can do it ONLY in the bottem center. and when drilling put the airbrush adaptor on and leave the hose open to the air. but more so where FULL protection, gloves, eye, apron, and a mask. i learned my lesson the hard way. they put a chemical called "Allyl Isothiocyanate" aka mustard oil. this chemical BURNS!!! alot and fast. when i was drilling into the can it started smelling funky and very unpleasant. i did this inside, which i do not recommend. if you get this stuff on you then use water to get it off. i ran to the tap and washed it off with water, cold water. it seemed to do the trick. i got it on my hand and neck. it left a red rash for an hour or so. if you attempt to do this i would place the can unside down. i washed the rest of the stuff inside the can with water. i then took the grill off my small bbq and placed the can on top and wrapped the top with the plastic valve with wet paper towel. i attempted to boil off the rest of the water so the can doesn't rust. i got most out but not all.
use teflon tape if you try it for the air compressor fitting. make sure not to over tighten as the metal is thin and can easily strip the thread.