How to Make cheap castable silicone from caulk

Simple, elegant casting garage just hack the user Instructables mikey77, those things "Oogoo," calls that, I think, and travel bag, "Oobleck" and "Sugru.
If you've ever bought silicone casting, and you know it can be very expensive. So, is seeking a cost effective alternative, and I once tried making alloys using silicone sell them dirt cheap in the building, if you know it does not work very well. Large seizures of up very slowly, if at all.
It seems, despite the fact that in some mixing cornstarch to speed up the drying process, much depends on how much starch you add. The author recommends starting with a 1:01 mixture. I'm not sure about his explanation that the process works because the starch is hygroscopic keeps moisture in the interior volume of the silicone, but in any case, there may be other additives that will speed the process as good or better than cornstarch. You can find one, so this is not a clear and transparent as possible Castings.
Also on a topical note, and commentator on our recent progress in the last choice of casting silicone that could fill the low storage devices pourable consistency by xylene hardware store silicone. (Thanks for that, SKR!) And is likely a combination of the two additions to the Silicon beer quickly this pourable consistency also made.