this is my first ever concrete cast. i made a half cylinder shaped form using acrylic and bass wood pieces, held together and sealed by hot glue. after pouring in a Rockite mixture, i placed the interior formwork piece (composed of shaped clay surrounded by duct tape)--displacing the concrete around it.the end result was a half pipe shape which on the outer surface took on the smoothness of the acrylic, and on the inner surface took its rougher texture from the duct tape. materials: 1/8" basswood, flexible acrylic, clay, duct tape, hot glue, vaseline, Rockite (pancake batter consistency)
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