I've seen quite a few posts in the past where someone will mention only using expanding foam once (as in, once it's been opened/used it can no longer be saved to use later). I guess that's the "proper" way to use it since it does only come with one nozzle that'll get plugged up once the expanding foam dries. I've always re-used and saved my expanding foam though, especially since I never use a whole can on one thing. Here's how for any of you who may have been tossing it out before it's empty.
*Remember!* Wait till the foam is fully dried before doing this. Otherwise it just becomes a gooey mess and doesn't come out in one nice piece, nor as easily.
This is the expanding foam I used and a cosplay piece I used it on.
As you can see foam can and probably will end up drying in random spots along the tube. Sometimes it's not fully blocked and others it's just hopeless.
In cases where it's blocked I'll find something that'll be able to scrap it out. Not everything is long enough though as you can tell in the photo above. I'm using some random tool I had lying around but even a toothpick can work.
When the nozzle is too long for the tool I simply just cut it down. I've never had a problem with it changing the way the expanding foam its applied.
It may take a couple tries especially if what you're using has no ridges. If you just press and pull along the side though you'll be able to pull out any dried foam.
It should easily come out in one piece.
Now do the same for the other end.
And one more time for the nozzle that's attached to the can. Then just reattach you cleaned nozzle/tubes and its ready for use!
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