So I gave it a try with some resin happy faces I wanted to make and it works!! The only down side is you can't see small air bubbles, so it has to be poured slowly and only a little at a time so the bubbles come up or you can blow them out.
Also it's not so easy to pop out so put it in the freezer for a minute or so and they will come right out! Ice cube trays work too.
So if you don't want to buy a mold this will do the trick
Happy resin making, love and kisses......2 of them