Bright white, fast setting, 1:1 mix ratio, urethane casting resins. The 300 offers a 3 min. pot life and 10 min. cure. The 300Q is 30 second pot life and 4-5 minute cure time. The 300Q is also a good one for casting into Dermagel or Moulage molds as it sets so fast that it doesn't have time to react to the moisture. 70D hardness. Smooth Cast 300Q is available in 2 pint (1.9 lb.) sets and 2 gallon (15.4 lb.) sets.