Hey guys, I'm looking to order Mold Star 16 silicone mold as well as Smooth-cast 321 urethane plastic to make a basic one part mold for a simple project. I have used Mold Star 16 before and have an idea of how it works, but I have never used Smooth-cast 321. In the technical bulletin provided on the website, it recommends a release agent for casting. Found here:
http://www.smooth-on.com/tb/files/Smoot ... 1,_322.pdfMy question is: Does anyone know if you need the release agent to cast with urethane plastic in silicone molds?
The reason I ask is because I haven't heard of using a release agent for casting plastic in silicone before, but I've never actually done it. So I'm just curious if anyone has any experience with this and would know.