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HydroSpan 100, from Houston-based Industrial Polymers Corporation, is billed as “a 3 dimensional copy machine enlarging any shape or design in near perfect proportion and detail.” Shown uppermost, a Morgan silver dollar from 1896, enlarged via three generations of HydroSpan 100 casting to about the size of a salad plate. To use it, two components are mixed and poured into a conventional silicone mold. After curing for 24 hours, the resulting casting is soaked in water for a period of several days, swelling it uniformly to 160% of its original size. The enlarged casting can then be remolded and the process repeated as many times as necessary to achieve the desired final size. Industrial Polymers also manufactures a shrinking casting resin if you want to go down the rabbit hole, instead.

  • Shannon Larratt

    Very cool! I was curious what it cost and found some web stores selling it (the first that showed up on Google was and it’s not expensive at all, about normal for casting resins. The shrinking one is even cheaper. This looks great, I can’t wait to experiment with this, thanks for the pointer!

  • Eric Hart

    I remember seeing this at the Compleat Sculptor a while back; they had some samples and examples out on their sample table. It looks like pretty cool stuff, making much more accurate enlargings and shrinkings than the old “let your alginate mold sit for a few days” shrinking trick. Unfortunately, they were not selling any “trial-size” kits, and spending $85 for 3 qts just to play with was out of my budget at the time.

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