Hydrocal Plaster for Scenery, Dioramas and Mold Casting 2 lb Pack Resealable Bag Great for Model Railroads Hydrocal Plaster for Scenery Dioramas and Casting Quick setting white plaster in water resistant resealable bag Full strength gypsum plaster, not cut with cheap plaster fillers Designed for strength and casting detail Accepts liquid or crystal pigment colors and stains