Li-Qua-Che 415 Activa Paper Mache Features Designed to be used with plaster ceramic molds, it dries to a hard, durable, break resistant product Stir the mixture with a paint stir stick, making sure that any material which has settled on the bottom has been completely blended in Pour slowly to avoid air bubbles Once the mold is full you can set it aside for 15-30 minutes, depending upon the size of the casting Depending on the size of your mold, you can generally empty the mold after only 15-30 minutes