naa man fuck that shit! Whats up Mark!? Sure detroit uses clay but if you are considering foam don't fuck around with green flower foam. That shit crumbles like crazy and desintigrates like it was a true green biodegradable stuff. Intead get extruded polystyrene foam. Essentialy it is used for house siding insulation. It comes in pink and baby blue and yellow. You can find it at lowes, home depot, I presume and menards. This is realy dense shit. I used it for making my subwoofer box mock up. If needed I will supply pics. Beyond that you just need a good shaper like rotozip and die grinder disc sander etc. You can pic up like a 4' x 8' foot sheet by say 1" for $15.Hey you guys should try using floral foam. U know that green stuff they use for making fake plants. Idk what design you guys are trying to do but if you need to you can glue layers together to give you your basic dimensions. Then get a cutting tool to cut your basic design, then just sand down to smooth the edges of your shape. Get it all nice and smooth then cover with aluminum foil, bondo and sand and work til smooth and then paint. Boom ya got your og mold. Just saying.