yeah i meant to say: wax works pretty well too, plus you can polish it up to a fine finish. they use wax in boatmaking, that much i do know, but the molds are resin/fibreglass not plaster, so not sure how well that would work. i remember making a mold in plaster in art class at school, and the forgetting to wax it before pouring clear resin in! boy that was a few lessons wasted in chipping the plaster off!!! ;D