Originally Posted by Shedofdread
Something that intrigues me - when I tried PU cores some years ago, when the wing was de-moulded, the foam carried on expanding and distorted the part. Is this something that you've encountered? Or has PU foam chemistry moved on [significantly] in the 10ish years since I did this?
I've had warping happen , but I didn't do closed mold expansion. Just fill both halves , cut to parting plane and join.
I always put it down to moisture in the PU....maybe what you have said was the cause.
Got me thinking.