I am looking for suggestions on making a hard master from an injected mold. I have a mold that was created custom for me, but the maker retired and I can't get anymore made. I want to make a hard master from the mold so I can make some new molds from silicone.
I was thinking of using plastic and adding a bunch of hardener to it, but I was curious if there is a better way before I start wasting money. Is there another/better material that I can use to make a hard master with an aluminum mold?