Arrowstone Free Flow provides a dense, smooth, bubble free result with a .08% expansion. Set time 5-10 minutes. Mix ˜6.5oz of ambient water with 2 lbs. of casting material available in blue, tan, green, and white. Arrowstone Free Flow is perfect for all weather conditions. The "tap test", or set-up time, is half of most common casting stone. Single use bags are perfect for single casts. Blue 2 lbs