The can of cleaner I have screws on just like a can of foam so you can install the can of cleaner and store it on the gun to keep everything sealed.
I've stored my foam gun for 6+ months at a time with half a can of foam on it and found it to work perfectly, I also don't do anything special when changing cans, nor do any of the other people who I loan my foam gun to, never had a can glue it's self on.
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