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

Propane is used as the propellant in them. In cooler weather the propane contract, it loses pressure. Just like your propane grill won't work as well in cooler weather. It is possible for contaminants to get inside, but not likely. I mean it is possible to get a bad can once in a while; no QC is perfect. But it does have a temperature range.