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Good question. The 1" foamular is $20 for a 4x8, if I were making just one layer it would be about $55 total for a 4x8 or $1.72/sqft plus tax. I'm using the foam glued together in layers to build up to the surface I'm trying to make. Part of that is because I don't really know what I want it to look like until it's on, part is using the foam as sound damping at the same time. It's *really* effective at cutting down on road rumble. And it's easy to form it with a 10" surform tool, and to get radii with the little curved surform. I use the fiberglass to go around the edges, and it sticks really well to the fiberglass panels, of course. If I screw up I just take out the angle grinder and cut it back, then surface with bondo, glass over the top, then bondo to finish the surface. The pic attached is partway through the rear wheelwell, showing the layers built up to get my final surfaces.
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