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I used a saw, and a surform. If it makes any difference, and I think it does. I used the spray foam "large areas" It seemed to cure much softer than the other stuff. It does expand much more though. I am thinking that on my next attempt I will fill the large areas with blocks of eps or xps foam, then fill in the gaps with spray foam. I was also thinking about building a lattice with very thin pieces of wood then draping fiberglass over that. Following that I would cover with bondo, and sand it down until parts of the lattice were exposed.
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