>>2049456
>So basically rubbers made for molds will just adhere to each other?
Roughly. Think of it as chemical compatibility.
>I just got a 3d resin printer with a large build plate so I was just planning on making some molds and then casting with a clear rubber.
That's actually a really cool idea. Most of the time people cast resin in a rubber mold, not rubber in a resin mold. One thing you could think of is printing a "master", making a rubber mold from that, then casting resin in that rubber mold.
One possible source of confusion is that "rubber" and "resin" are terms used for many different substances.