There are other products to make this, to be sure.
Clear Urethane resin is a fair bit more expensive (roughly double), would likely be best in a silicone mold, is touchy to moisture and humidity (discolors the clear), and requires the ability to accurately measure and mix the 2 parts at the proper temperatures. The cost alone turned me away from these.
Epoxy resin being the other I know of. Again, it was more expensive, but not much, and in my experience is VERY touchy to both temperature and accuracy of mixtures (often not simple 1:1). Ruined one of the smaller skull molds exploring this as the stuff never set up, another came out more a frosted glass look, a third was nice and clear. Which was aweful confusing to me as I measured and mixed all 3 at the same time.
(I'm not even counting any products requiring hot pours)
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