Finally found the file of originals of this series of pics from 2003 when I made a bunch of cool composite molds for a couple of precast concrete yards in San Diego. Mold making is an odd sort of skill, requiring many different kinds of building skills and knowledge of different products to pull off > no wonder I like it :)
 
This is one of my favorite “hero” pics, where I’m demolding the plaster original of the biggest corinthian capital I’ve personally seen poured in concrete.
 
The “jacket” I’m holding in my hands is a flexible urethane mold that, when held in shape by the rigid outer mother mold, will recreate all the ornamental detail of the original in new concrete capitals.
 
See the first concrete part pulled from this mold.