I've used both. Bondic tends to be clearer than regular "clear" 2 part epoxy which tends to have a little bit of a yellow cast. The clear casting epoxy Steve listed above is clear as water and works really well, but the last container I had of it solidified before I could do much with it. You might look into getting a UV nail lamp. Then you could just put the mold in and let it go while you do other stuff.