In this video, industrial designer Eric Strebel shows how he used many coats of gesso to get a nice smooth finish on a urethane foam prototype that he’d carved.
People in the comments say you can get similar results with layers of PVA glue which is cheaper and dries faster than gesso.
Source: https://blog.adafruit.com/2021/11/06/using-gesso-to-finish-foam-prototypes/
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