Shipping foam used to make spare parts?

[dradams2]

I was wondering what kind of foam the shipping boxes are made from that Freewing ships their jets in. Has anyone used it for anything for their planes or other models?

[RRHandy]

Polystyrene, will melt with use of most glues.

[xviper]

I used the packing box that my AL-37 came in to make a stand for the plane since it’s the same shape as the fuselage. I used FoamTac to put it together. I think packing box foam is not as dense as what they make model planes out of.
I once had a plane that chewed a piece of wing tip out after a crash. I used a piece of shipping box foam and carved it to fill in the missing piece. Glued it on and taped it with wing tape to form a “skin” on it and to help support it onto the main part of the wing. Seemed to work OK but I wouldn’t make a whole plane out of it.