You most certainly can pour tar gel into molds. At least the flexible molds. I used Makin's Clay mold with Versamark ink to keep the gel from sticking. I tried to peel one of the leaves out this morning (I made three) and it ripped because it wasn't dry yet. I just pulled these two perfect leaves out tonight. They came out easily, and they are perfectly formed. Very cool. Thank you, Aimee, for the idea! Now there are lots of things I can do with this stuff, lots of embellishments to make that can be used on 3D things.