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niel, epoxy isn't simply a "glue". the epoxy resin (key word resin) hardens to form plastic. a glue is simply meant to hold two surfaces together, and lacks any strength independent of the material being glued together. epoxy is used because, even though you still need to use care to leech out as much as possible to attain optimal strength, it properly bonds with the fiberglass, carbon or kevlar fiber, as well as the substrate to form a proper structurally sound layer.
I agree, he would need much more than one layer to allow a: sanding without loss of too much material in the finished product, b: enough strength and rigidity to function as a car, and c: a surface that can easily be repaired in the eventual case that damage occurs, and resist damage.
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