I use waxed paper and plastic coated freezer paper under everything and silicone cures right on top of it! If you make a resin mold, don't use latex then try to use silicone. While the resin doesn't absorb any of the latex, it's not glass smooth and micro-residue will adhere to the surface of the resin mold and you'll ruin your rubber.
To tell you the truth, I don't know why anyone uses latex. It doesn't seem that much cheaper, it smells, you have to do many thin layers, and some people have violent allergies to it. I would love to hear arguments for latex...in a separate thread!
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