I don't know if you saw this site, but there's some instructional videos there that might help.
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Mold Making & Casting | Supplies & Materials | Molding & Casting | Silicone Mold Making | Rubber molds, Plastic Molds | Silicone | Rubber | Plastics | Resins | Epoxy | Foam | Polyurethane | Urethane | Liquid Plastic | Plastic Molds Casting | Cast | Moldmaking | Molding | Polymers