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I've got a pod on order and was thinking the same thing, but my experience with expanding polyurethane is that you must be very careful with the amount of the liquid you use. I've seen Dyna bolts pulled out of a concrete floor with just a little too much pre-foaming liquid put in the mould. So a very accurate measurement of the volume of the space between the skins is needed, A little beyond my maths skills!
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