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EPS, isn't that the white stuff that is used in most sheeted foam wings? Or are you talking of some other application?
I have never heard of anyone using EPP in jets, except maybe slope soarers (pss), or small edf models.
But then again, I have not heard it all:-)

regards

Lars

Nevermind, I've made a collosal mistake, my wings are EPS, and someone along the way told me I was using EPP.