Hi,Doesn't the can come with a lid? A top? A cap?
Well yes and no. It comes with a cap, but you take it off to screw the spout on and once on, you dont want to have to keep taking it off. Thus the can has a flat bottom but a spout on top.
The paint can i was referring too is a spray paint can. This is like a spray paint can with a long spout on top that sticks up about 3 inches. It's about 3/8 inch diameter where it screws onto the smaller spout, and about 1/4 inch diameter at the top about 3 inches from the top of the metal can, and points slightly side ways too so it is angled slightly.
Also, the 'cap' that came with it was a small cap, not what you find on say a spray paint can. It's maybe a little more than an inch in diameter. If the top was falt (dont remember that though) it would be a balancing act to turn it upside down. But before that, the spout would have to again be unscrewed and put somewhere for storage and the tiny cap placed back on. Thus i think a jig of some kind or a strong magnet maybe would be needed to hold it upside down. I just cant see doing that anyway though.
The grease has no way of holding the air in any particular place anyway because it is a gel not a solid.