Nice comment, Keith, about cleaning the threads, and then lubing them. I have always cleaned up the threads on both the bottle, or can, and the lids. I had not thought to put some kind of lube on the inside threads of the lid, but that's a very good idea.
I used a small bottle Linspeed Oil to finish a stock, when I was a teen, and stored it upside down. I then used the same bottle to finish the stocks on a couple of more guns a year or so later, again, storing the bottle upside down. When I went back to use the oil to do yet another stock a few years later, I had two visible, and separate Rings in the bottle, air between the layers, each with a dried coat of finish that prevented the good finish from going to the bottom of the bottle, when I uprighted the bottle and opened it. After that last stock, I used a nail to pierce the layers, then closed it up and threw the rest away. There was not enough left to do another stock.
I had seen the same kind of thing appear in partially used cans of paint that were stored upside down, when opened later, but with the glass bottle used for the Linspeed, I could see the layers through the glass.
It made me a believer of my father's advice, and direction. That's pretty important when you are a teen, and think everything your father tells you is "Suspect" at the very least!