Earlier, LCT Paintball wrote:

That's interesting.
I've read that most composites must be painted
white to reflect heat that could damage the foam.
Do you think you could get by without the white
paint?

Well, there are resins available that will take the heat. The trouble
is that they're not commonly used in the home workshop environment.
High-temp epoxies tend to require special high-temp curing. I think
there are also vinylesters that take high temps okay, although I
understand they can be tricky to work with. They also eat styrofoam, so
you can't use them on Rutan-type construction.

And, like you say, styrofoam also has a fairly low service temperature.
But other core foams like Divynicell (rigid PVC) does come in
high-temperature formulations, and is compatible with vinylester.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com