foam filling masks with home depot foam

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******EDIT****** The day after I shot the video I checked the masks again- after the foams full cure time the foam was very firm and rigid. I bet it would work fine for fence posts and save a ton of time!
This is how to easily and cheaply foam fill masks with a product you purchase from home depot. It is also an experiment- a project I have never done before and am trying in front of the camera to show my thought process as much as the project.
here is the product link-
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