I have used it a ton like I said before. I found that it is sensitive to relative humidity. Definitely like it dry, 50% RH or less. I like to apply the finish during a cooling period, in the evening as to reduce outgassing of the wood or air expanding and causing bubbles. If used straight, I like o apply the first coat with sandpaper, then wipe the excess off across the grain. I do use the armorall method frequently, but the final 2-3 coats without it to reduce the milky haze. Acetone works very well to thin it if covering checkering or details you don't want filled in with finish.
The marbles is a good tip, but I also store mine upside down to reduce the chance of air intruding into the bottle. If you try the armorall method, be sure to pour a small amount of oil into a seperate cup so you don't contaminate the bottle.
-Xander