TC-812 A/B LIGHTCAST is a low viscosity, quick setting, easy to use casting material. A model or tool cast from TC-812 A/B LIGHTCAST will weigh 60% less than other filled urethane systems. Within 60 minutes after mixing and pouring, it is ready to be carved, sanded, filed, tapped, etc.. Its characteristics make it ideal for lightweight backing of laminates and/or surface coats. Perfect for fast take offs, cores, engineering changes, temporary molds, patterns, models, prototypes, and bases for die molds.