Are they making new episodes of Roadkill or was this an older one?
The one big caveat is that the original propellants are non-oxidizing and compressed air is not. For something like PB Blaster, this would probably be fine for as long as you needed it.
For something like paint, I would expect the clock to start ticking as soon as you filled it. I would be fine using it right away, but I don't think I would refill it and put it back on the shelf.
I agree. It will probably only work once per rattle can. But that’s usually all you’d need it to work since the can is probably on the last 10th of product.
I see stuff like this on the ROADKILL Facebook page.