This Instructable video shows the process of making a silicone mold from an existing ceiling medallion and casting replicas using urethane casting resin.  Great for restoration work and one-of-a-kind pieces no longer available.
<p>How many times can you use the mold before it degrades?</p>
Multiple times. With a piece like this I would say 50-100 maybe. You can also extend the life of the mold by using mold release spray prior to casting.
Thanks! I normally use alginate, but you only get one shot with that and it would be nice to be able to do multiple casting.

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More by AlumiliteCorp:How to Mold & Cast Architectural Moldings Silicone Glove/Skin Molds Creating & Carving Fishing Lures Out of Resin 
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