I know it may not be huge concern to you, but I have found that polyesters suck for molds because of exotherms and shrinkage but I guess (just like everything) it depends on what you are doing.
One product I used that I was pretty impressed with was Chock Fast Orange - it is an industrial potting compound used to set engines and such for large applications. It has negligible shrinkage - even in large volumes. I can't recall the cost - I think it was about $40 for a 1.5 gallon kit - far more expensive that plaster, I suppose....probably not what you want, I donno.
Just watch out for the exotherms (curing heat) if you decide on polyester or other catalyzed resins, ynneb. Don't mix 'em too hot - keep the thicknesses to a minimum be careful duplicating plastic parts that you wish to preserve - they may be destroyed by the heat.
Scott
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