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Hi Chris, I cast urethanes for a living, been doing it for about twenty years. I've tried "injection molding" thermoset resins and never had any real success with it but always suceeded in creating and incredible mess. I think folks are trying to obtain intricate detail by trying this technique. When free-casting, little air bubbles get trapped in the small sections and prevent resin from filling the mold completely. I've always gotten good results by spin-casting, the same process used to cast metal... only using urethane resin. It's a simpler rig to set up, and you don't need a compressor. If you have an old lazy-susan bearing you're halfway there. Lew
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