We are now on the third version of silicone enclosure mold design and the results are quite promising. Alongside improvements in the venting and alignment features of the mold, a lot of effort has gone into the sealing, mixing, degassing, curing and de-molding process.
In the above photo you can see the three molds produced so far. Molds 2 and 3 have just been opened after curing and the finished enclosures have not yet been removed from the mold core.
Here is an example of a finished enclosure: (please ignore the bubble...)