if you end up pouring your own castings.... why would you need a hardener? 2 part self skinning moulds will hold up for quite some time. Look at a few dvd's out there on moulds and lifecasting.... see if its something your willing to put time into. I learn something new everytime I do a new pour.... a shortcut or a better long way.... I love people that want to make something original, its nice to see someone mix it up a bit.