It would work fine if there was absolutely no movement or flex in the surface underneath maybe add some bracing. You could also use a matt emulsion paint with a foam roller once working to the final finish, this is fantastic to sand and gives a very smooth finish, but I would be in fear of having 50 hours sanding and paint prep ready for molding then a slight knock or tweak and chunks of filler start flaking off. Have you priced up 2 part body filler from a local paint factors? The one I use has good prices on bulk.
In the car design houses they used to make life size mock ups from clay I wonder if they ever considered curing them and taking molds. Ed.
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