Queston about the spare tire inflator

[cottonpicker14]

I always worry that the contents of the inflator may not work being its been in the TTA for 20 years.
Some questions:
First, Anyone know if the contents (cardon dioxide I believe is what is inside) can be refilled ?

Second question.
I carry a small Sears tire inflator that runs off the cigarette lighter. Any idea if this would be strong enough to inflate the tire especially since it is collapsed and seems that it would need alot of pressure ?

Third question
Once the spare is inflated, can it be collapsed to its orginal compact state ?

Thanks guys