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this is the same process im using , its ends up suprisingly strong ... and if you really need strength just carve your shape and fiberglassover it for super strong forms..
This is very easy to do .. Howebver i can tell you a few tips..
1 spray can foam has a tendency to shrink.. in the last part of its curing proces it shrinks up by like 5% so if you filled a gap.. it may unfill when it cures.. this can easly be fixe3d bu doing a second fill of foam after the majority of the foamis finalized.. this second application also fills in any large pockets ofair that form from the spray foram.. Otherthan that , sand it down and smooth it with bondo or fiberglass over it and your got a great light method to sculpt your car.
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