I've always fancied the idea of a paint-on latex that I could use to make a mould of my erect penis and balls. I think you paint it on in lots of thin layers to build it up and it dries in minutes. When the mould is thick enough, and set, you can peel it off and then use it to make an exact model of your pride and joy. How about that for a conversation piece on your coffee table !!
I remember using moulds like that with a resin kit many years ago to make chess set pieces. Does anybody know if it would be safe to use on a delicate instrument like a cock ? I suppose it might be difficult staying fully hard for long enough too.