The caulking gun silicone is much harder to use to make molds. Because it cures so slowly when it's thick, I had to coat the master with a cover coat, using my finger to force it into all the details, and then mix some water into the rest of the silicone as I filled the mold, so it would set up overnight. Otherwise, it would take a week+ to set up. It still came out with voids, and the molds are a pain to pour.
I don't use it anymore, period.