I've never done any casting, but I'd like to attempt a Mt Goat horn cast to make a few sets of repro horns/bases. I THINK I can stumble through the casting process, but was concerned about what release agent to use on the horns. I don't want to inadvertently stain/grease up/darken the horns in any way by using the incorrect release agent. Any suggestions for a "newbie"? Any and all advice will be greatly appreciated. ???