>Warm up the wing with a hot air gun (monokote variety) 
>and gradually heat it (top and bottom) until you have 
>about twice the amount of final twist you want.

This works, but it's risky.  You want to heat up the epoxy
to at least 200F for a nice permanent set, but the foam
will start to melt at 250F or so.  That's not a big spread,
given the rather poor temperature control of a heat gun.

Using boiling water is totally safe by comparison,
since it cannot heat the wing above 212F.  The water
also heats up the skin almost instantly, while
the heat gun requires considerable patience.

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