Pink and blue foam are produced with some surface tension in the skin-like
layer on the top and bottom surfaces. If you spraymount down a block of pink
foam and cut a layer off the top using your hotwire, that layer will curl to
some extent almost every time. Generally the thinner that first cut o
Welcome to extruded foam sheets. The pink Foamular (not Dow) foam you
were using can have quite a bit of stress in the skins. You have two
options. One is to shave a thin layer off the each side, the other is
to score the top and bottom of the sheet before you cut it. Using a
plank in additio
I have had foam cores do this before, always with pink or blue foam, not
white. I have later bagged this wings, with no noticeable effects. I think
its just stress that is built into the foam that is relived when it is cut.
As long as the wing is sheeted on a flat surface it should remain fl
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