I would not advise anyone to do this!!! Unless you don't mind the risk of losing a fair amount of money. Why? Making something from silicone is hard!!!
I have done my fair share of working with platinum silecone and other forms of silicone so I am a bit experienced with it.
The initial post misses tree extremely important things!
1. Platinum silicone always is a two part solution. 1 part silicone and one part to start the curing proces.
2. It is most likely that you need a vacuum chamber to remove airbubbels from the silicone mixture after it is mixed. And most people don't have this laying around the house.
3. Don't EVER get any latex near silicone if there is only the slightest change it isn't 100% cured. Because latex contains/leaks sulfur and if only a small part of sulfur leaks into not cured silicone then the silicone will never ever cure. Sulfur is like poison for silicone.
-edit-
thatperson1551 did you actually made your own breast forms?
