Can I use hardware store silicone / rubber for moldmaking?
I need a flexible, reusable, poured mold but it needs to be as cheap as possible. The RTV silicone that I see available specifically for moldmaking is too expensive for me. I know that there are lots of different formulations of silicone and rubber for home improvement and automotive use, and most are inexpensive. Are any of these good for making molds? Which is best?