Expandable Foam Grows in Water

I just came across a new Urethane Foam technology that grows in water to 60% of its original size.  The cool part is that when the material grows in water, it expands equally and evenly to accurately show all detailed features.  This sounds like an awesome product for any artist that is wanting to create any form or statue type sculpture at a very low cost of reproduction.  Basically, you take the original model, mold it in silicone and then cast the expandable foam.  The foam comes in transparent blue and I believe it can be painted and sanded as well.  The only problem I see is that it can take up to 14 days for the full expansion to take place.