Silicon sticks to silicon, but urethane does not stick to silicon

Sure that may seem obvious to you, but it takes a lesson in mold making for me to learn that urethane does not stick to silicon, but silicon will stick to silicon when trying to make duplicate molds. The idea here is to increase my production capacity on the type of molds I am making or to come up with a more direct way of making reliefs. The raised texture and small pattern have helped me overcome some of the glossy effects of using an epoxy gel coat as the main top surface, so making a more efficient way to create the reliefs has become my current goal.