Insulation foam knife.
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Previously:
https://www.homemadetools.net/forum/...066#post199175
https://www.homemadetools.net/forum/...277#post138673
https://www.homemadetools.net/forum/...162#post141533
https://www.homemadetools.net/forum/...090#post149542
https://www.homemadetools.net/forum/...306#post126907