3M™ PRIMACAST™ UNPADDED SPLINTS Offers the speed and strength you expect in synthetics, with a water-activated material that sets in 3-4 minutes and functional strength in just 20 minutes. Provides a plaster-like conformability for easy molding, better mobility than fiberglass splints, and lower profile than competitive padded fiberglass splints. Provides superior radiolucency for easier diagnosis from x-rays.