I made a two part silicone mold of a real pumpkin. I used AeroMarine Products 128 Pourable Silicone for the mold and used petroluem jelly to keep the two parts of silicone from sticking together. To cast the pumpkin I used AeroMarine Products White Urethane Casting Resin mixed with Smooth-On So Strong Urethane Colorants in brown and orange. I poured the stem first, let it set up for 30 minutes and then poured the orange body of the pumpkin.
Silicone mold with colored urethane resin pumpkin. Used with a real pumpkin and flowers to make a Thanksgiving centerpiece.