Use Crystal Clear™ 200 clear urethane resin to cast into the mold. The mix ratio is 100A:90B by weight. Dispense Part A and Part B and then thoroughly mix the resin. reassemble the mold and insert a funnel into the pour hole to help minimize spills. Pour the Crystal Clear™ into the funnel. Place teh rubber mold containing the resin in a pressure pot and subject it to 60 PSI (4.22 kg/cm2) pressure until the resin cures (16 hours). Pressure casting resin is optimal for creating castings that are truly bubble free.