New Spray Paint Cans That Stop Spraying After The First Squirt?

When the can I mentioned in post #1 locked up, it was putting out nothing--no way to have cleared it spraying upside down or not, it just quit completed like someone had turned the water faucet off tightly. And why it started working again after having been in the sun is still a mystery, I wonder sometimes what is going on inside those cans (and closed bedroom doors, for that matter).