04-06-2005, 05:58 PM
Plaster of paris works fine for molds, it\'s less dense and it will absorb the water from the latex faster hence it\'ll take less drying time. The time you let it dwell depends alot of the grade of latex you\'re using. The main problem with plaster of paris is the mold will degrade quicker than ultracal, but if you\'re using it to make production molds from a master it doesn\'t really matter and the price difference and availability of plaster of paris more than makes up for it.