Hi,

Im fairly new to this. Whenever I see polyurethane cast, it appears that silicone molds are used. Is there any alternative because I am trying to cast a large shape that is only 1cm thick. The overall PU content would be 2litres, but the volume the mold would take up would be 86litres (which makes using silicone very expensive!!). I can machine the molds from polystyrene. Could this be covered in epoxy and then used as a PU mold?

Cheers,

Markie