There’s lots of fun things to do with expanding foam… this is just one of them. But like the guy says, “Safety First!” It can be quite powerful. I worked with this carpenter once when the stuff was still pretty new, and he got all excited showing me how good it was for sealing around doors/windows, etc. He used too much on this one doorjam, though, and it kept expanding till it broke the thing. A costly mistake!

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