Re: For those that want to try to cast heads but havent yet. Featherhorn, my statment about silicone not sticking to anything was not correct, of course silicone sticks to stuff, we use as a everyday sealant and adhesive. What I should have said is that many things will not stick to silicone when it has dried except its self. If you are using synlube as a release and are using the plain old silicone ( not siliconized accrylic or the newer elastromastic types that are out there then it should be working for you as it has for myself and many others. What brand and type of silicone are you using.