I?m in the process of insulating a room internally and so thinking of getting a gun for expanding foam. Is it possible to take the can off while there?s foam in the can? ie do the cans have valves, and can you expect to be able to use the foam again after a while? Obviously the gun would need cleaning. Part of the reason for the question is that I might want to have two cans of foam on the go (normal and low expansion).
I had a look in the wiki but didn?t see an answer.