The metal pro guns flow a lot more and have way better control over the flow. Awesome to use on big jobs. They do require cleaning. It will still cure in the nozzle.

With single use cans sometimes the spraying them upside down thing works but if you’re trying to get another use do that, take the straw off, and stick a piece of wire into the little tip on the can. The foam expands as it cures. You just need a little hole for it to get through and the pressure can push some blockage out.