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why is my expanding foam shrinking?

I am using it to fill in the neck of my de-capitated maniquin.
Today I noticed it shrank!
 

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I don't know, but I had the same problem making skulls, now they look like shrunken heads lol
 

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One part polyurethane foam (Great Stuff, etc. ) needs a little moisture to cure. If you apply too thick of an amount it doesn't get enough atmospheric moisture. This results in gooey centers and shriveling/shrinking.

To prevent this, mist the area you want to foam, apply a single layer of foam, then mist lightly with water again. Lay down another layer, mist again. Continue until the desired amount of foam has been used.
 

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LIS that is exactly what I did, and I still have the shrunken head look,IDK maybe it was making them in the cold basement them bringing them outside in the heat to finish cure.
 

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Huh. Maybe it was the temp. change. I've only had temp. problems when I stored "not quite cured" foam in the shed, in the summer. (Bubble collapse) Yeah, not the best place for latex and polyurethane... I know!

The only thing I can think of is perhaps try a finer mist of water. Just guessing here though!

Lemme know if you find out the problem.
 
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