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FWIW, I'm told that urethane foam may be better from a chemical compatibility standpoint, as Gorilla glue is just liquid urethane. Further, since polystyrene foams are dissolved by polyester resin, you need to use more expensive epoxy with them, another reason to stick with urthane foam in the first place. Not hotwire-able due to toxic outgassing, urethane foam is nonetheless said to be easier to sculpt and shape with sanding, grinding, etc..
For compound curves, consider kerfing the back side of the foam.
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