Smooth-On Smooth-Cast 305 - 2 Pint Kit SMOOTH-ON SMOOTH-CAST 305 - 2 Pint Kit 30 minute demold time and 7 minute pot life Cures Slower than Smooth-Cast 300, quick enough for rapid turnaround Bright White Color, can be sanded and painted East to use, equal parts a and b. No vacuum degassing required