I'm thinking about making a silicone cast of my penis (i.e. a dildo). I know there are kits out there, but i'm guessing it will be cheaper (and more discrete) to just get the stuff I need and do it myself. Does anybody have any experience about this? What do I need and where can I get it? I'm guessing, some kind of alginate is needed for the negative mold, but there are alot to choose from. Anything in particular I should look for? Tips, comments, suggestions? Thanks!