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yeah 12 hours it cures but not fully you need days to let it cure up bofre ot can make a decent base ... i found that for thing shapes like a kamback using sheet foam or fiberglass over a mold or shape is the way to go .. my rear wheel skirts are just fiberglass resin with cloth as the fiber.. but not fiber glass cloth.. works well and allows some flexability.. want rock hard and fairly thick.. use fleece fabric, or hard and thin..fiberglass cloth.
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