I'm trying to create some silicon molds of some Frosted Ultra Detail parts I've created and the silicon keeps sticking to the parts. It's like their too porous. Has anyone done this before? Any suggestions? I'm using the Smooth-on OOMOO 30 and OOMOO 25. If there is a different type of silicon mold mix I should be using? I've lost two batches of molds and the parts are shot, need to order more.