Resin casting lets you produce ... You’ll want to let the release dry and polish it off. It’s usually optional, as silicone doesn’t stick well to many thermoplastics, but if you have a ...

Pretty soon he was using silicone rubber to make two-piece, high-quality molds of lenses, good enough to try a few casting shots with epoxy resin. [Zach] ran into a few problems along the way ...