A: That's a question for an engineer, or you would have to experiment with it. Typically you can not compress liquids so I'm not sure what benefit will come from putting it in a press if you are casting. The right epoxy and fibers will cure up hard and strong without being pressed. Casting is commonly done with epoxy by making a silicone mold of the original part which makes it easy to remove the finished product. Such molds are commonly placed in pressure or vacuum pots to remove air bubbles. If you are laminating layers of fiber, clamping between two nonstick surfaces is sufficient two squeeze the air out and impregnate the fibers for good adhesion.